There will be 50 questions getting increasingly difficult (And unfair - some designed so you absolutely cannot cheat.)
You can post once, I will message you/reply to your comment with your score.

1 - What Pokémon, in the Sinnoh Pokédex is #7, #8, #9?
2 - What is the "Electric mouse" Pokémon?
3 - What is its evolution?
4 - What is the first generation's grass type starter Pokémon.
5 - What is its evolution(s)?
6 - What Pokémon, in the Pokémon Mystery dungeon: Red Rescue Team, stares at the sun all day and is said to be able to see into the future?
7 - What Pokémon type has no type weakness besides itself and Ice in generation 1?
8 - Who is Indigo Plateau's champion, before Blue - and eventually Red - takes it?
9 - What Pokémon can gain the highest attack power in game (Through the use of moves)?
10 - True or False: In Pokémon Gold/Silver/Crystal, is it possible to get a Growlithe, just before the first gym?
11 - What is the maximum number of coins you can get in your coin case?
12 - Where can you find Mewtwo in Generation 6 (Pokémon X and Y)?
13 - How many badges do you need in Pokémon, to enter the Pokémon League and challenge the Elite four?
14 - What country/countries have banned Pokémon Go? 
15 - What country makes Pokémon?
16 - How many badges are in Pokémon Gold/Silver/Crystal (Generation 2)?
17 - During its first weeks, what happened to Pokémon Go?
(These next 3 may have varying answers, So I'll accept a few million off of what I got)
18 - How many (Main Series) copies of Pokémon (Games) have been sold? 
19 - How many (Spin-off) copies of Pokémon (Games) have been sold? 
20 - How many (total) copies of Pokémon (Games) have been sold?
21 - What Pokémon was deemed "Racist" in Western countries, because of its facial features and colouring?
22 - What is commonly referred to as "World's most useless Pokémon?"
23 - How much do you buy Magikarp for? Don't need to specify where, you were all tricked into it, don't lie to me
24 - Who are the main antagonist team in Generation 1?
25 - Who is the head of Team Rocket?
26 - Who is the head of Gym 8, in generation 1?
27 - Who is the very first Gym leader you meet? 
28 - Who is the next Gym leader you meet?
29 - Yes or No: In Generation 1, can you get later badges before earlier badges?
30 - What Pokémon shares a name with an ancient kingdom's inhabitants? 
31 - How do you get Drifloon in Generation 4? 
32 - How do you get Spiritomb in Generation 4?
33 - What is the  main legendary Pokémon in Generation 4?
34 - Which Pokémon are considered a pair in Generation 3?
35 - According to IGN, what is the scariest Pokémon?
36 - Which Pokémon has 8 different evolutions?
37 - Which Pokémon names are Palindrome?(Spelled the same forward and back.) 
38 - Which Pokémon has the highest (Base) attack stat in Generation 1?
39 - Which Pokémon has the highest (Base) attack stat out of all Pokémon?
40 - What Pokémon can learn: Spacial Rend?
41 - What Pokémon can learn: Roar of Time?
42 - Which Pokémon has a paintbrush as a tail?
43 - Which Pokémon constantly sings in the anime and puts people to sleep?
44 - Which Pokémon needs a Pokéflute to be fought?
45 - Which Pokémon game was never released in Japan?
(These next 5 will be extremely difficult to answer, if not impossible.)
46 - What is my favourite Pokémon in all gens?
47 - What is my girlfriend's favourite Pokémon in all gens?
48 - What is my favourite city/town in all gens?
49 - What is my favourite Legendary Pokémon?
(If you answer this next one correctly, before the 10th March, 2017 you will get 20,000 Viz from me)
50 - What are the 5 Pokémon in my Pokémon Diamond party. 

I can answer most of these besides a few and the literally your personal likes and stuff.
#1 Piplup, Prinplup, Empoleon
#2 Pikachu
#3 Raichu
#4 Bulbasaur
#5 Ivysaur, Venasaur
#6 Xatu
#7 Dragon
#8 Lance
#9 Shuckle
#10 True
#11 9999
#12 Unknown Dungeon post game
#13 8
#14 I don't know anything about pokemon go but one guess is China
#15 Japan
#16 16
#17 Servers crashed?
#18-20 no idea
#21 Jynx
#22 Magikarp
#23 500
#24 Team Rocket
#25 Giovanni
#26 Giovanni
#27 Brock
#28 Misty
#29 True (Saffron Vermilion and Celadon)
#30 Bronzong I think
#31 Believe on a friday at the windmill place
#32 Having the platinum flag underground and then taking the odd keystone to the hallowed tower
#33 "main" would be how I think you mean it giratina because platinum
#34 Minun Plusle
#35 No idea (Vivilion because 666 not really though)
#36 Eevee
#37 Girafarig
#38 Dragonite I think
#39 Arceus mega rayquaza don't think you want megas
#40 Palkia
#41 Dialga
#42 Smeargle
#43 Jigglypuff
#44 Snorlax
#45 Pokemon Red
#46-50 literally I think impossible to guess due to sheer number of pokemon unless you have some kind of thing on tumblr I won't register to look at

Feel like 80% of this will just be a copy of the post before me but w/e

1) Piplup - Prinplup - Empoleon

2) Technically there is none, as Pikachu is just classified as the "Mouse" pokemon and not as the "Electric Mouse" pokemon. So Pikachu is an incorrect answer.

3) Read above

4) Bulbasaur

5) Technically it only evolves into Ivysaur. But if you're counting Ivysaur's evolution then Venusaur is correct as well.

6) Xatu

7) Dragon

8) Lance

9) Shuckle

10) True

11) 9999 coins

12) Unknown Dungeon

13) 8

14) Mate I have no clue. North Korea? Japan? China?

15) Japan

16) 16

17) Fairly certain that the servers overloaded and crashed. Shows how good of a game it is.

18) 250.000.000

19) 100.000.000

20) 350.000.000

21) Jynx

22) Magikarp

23) 500

24) Team Rocket

25) Giovanni in Kanto games, Archer in the Johto games

26) Giovanni

27) Assuming you mean in Gen 1, it's Brock.

28) Misty

29) Yes

30) IDK maybe Type:Null lol

31) Visit the Valley Windworks on a Friday and interact with it.

32) Interact with like 300 people in the underground and bring an Odd Keystone to the weird grave well thing on the route below Solaceon Town.

33) Guessing Giratina because it plays a role in all three of the Sinnoh games.

34) Minun and Plusle, Volbeat and Illumise, Zangoose and Seviper, Latios and Latias, Groudon and Kyogre.

35) Drifblim because it takes away little kids at night.

36) Eevee

37) Eevee, Girafarig, Alomomola, Ho-Oh

38) Dragonite

39) Mega Mewtwo X. Excluding Mega Evolutions it's Kartana (new gen 7 pokemon).

40) Palkia learns it, however Arceus and I believe Darkrai can have it per event.

41) Dialga learns it, but Arceus and Darkrai get it per event.

42) Smeargle

43) Jigglypuff

44) Snorlax

45) Pokemon Blue

46) IDK Lucario?

47) Jigglypuff?

48) Saffron City

49) Lugia

50) Empoleon, Staraptor, Luxray, Rapidash, Machamp

1 - What Pokémon, in the Sinnoh Pokédex is #7, #8, #9?
That would be, if I remember correctly, the Fire-typed starters. Because I think it goes grass, water then fire for starters.

2 - What is the "Electric mouse" Pokémon?
There are a few Electric Mice, but the most famous is, in fact, Pikachu - Even though it's only known as the Mouse Pokémon

3 - What is its evolution?
Raichu, or Alohan Raichu if you're in Aloha.

4 - What is the first generation's grass type starter Pokémon.
Bulbasaur, which is grass/poison.

5 - What is its evolution(s)?
Ivysaur and Venasaur.

6 - What Pokémon, in the Pokémon Mystery dungeon: Red Rescue Team, stares at the sun all day and is said to be able to see into the future?
I have no idea... Celebi?

7 - What Pokémon type has no type weakness besides itself and Ice in generation 1?
Dragon, as it's the only type weak to itself.

8 - Who is Indigo Plateau's champion, before Blue - and eventually Red - takes it?
Lance.

9 - What Pokémon can gain the highest attack power in game (Through the use of moves)?
Shuckle?

10 - True or False: In Pokémon Gold/Silver/Crystal, is it possible to get a Growlithe, just before the first gym?
I think this is false.

11 - What is the maximum number of coins you can get in your coin case?
The cap is 99,999.

12 - Where can you find Mewtwo in Generation 6 (Pokémon X and Y)?
The Pokémon Village.

13 - How many badges do you need in Pokémon, to enter the Pokémon League and challenge the Elite four?
You need right, except in Aloha, where there are none.

14 - What country/countries have banned Pokémon Go?
Pass.

15 - What country makes Pokémon?
Japan, obviously.

16 - How many badges are in Pokémon Gold/Silver/Crystal (Generation 2)?
Sixteen. Eight Johto, eight Kanto.

17 - During its first weeks, what happened to Pokémon Go?
It hit 1 million downloads?

18 - How many (Main Series) copies of Pokémon (Games) have been sold?
300 million

19 - How many (Spin-off) copies of Pokémon (Games) have been sold?
175 million

20 - How many (total) copies of Pokémon (Games) have been sold?
475 million

21 - What Pokémon was deemed "Racist" in Western countries, because of its facial features and colouring?
Jynx