I would probably go with gengar. It is kinda cute in a creepy way. XD

My favorite ghost type is Spiritomb. It's actually a ghost-dark type. There aren't many ghost types I like, simply because they never seem to come into play for me.

They are useful in a pinch against psychic types, but otherwise, I just never use them.

Spiritomb in particular is cool because of the unique design.

Going to throw a vote at a very recent favorite of mine, Runerigus. It’s the new evolution of Yamask, well, the galarian Yamask at least. I guess it’s a counterpart to Cofagrigus which was already one of the cooler Ghost types out there. It has a unique evolution method, requiring so many weird steps it’s one of the only ones I’ve ever had to google lmao. Upon taking at least 49 damage in one fight without having Yamask faint, you have to run under this random rock formation somewhere in the Wild Area. How any kid without internet is supposed to figure that one out is beyond me. Maybe an NPC tells you about it? I can’t remember talking to one.

Appearance wise it’s a perfect continuation of its pre evolution. I love how it builds off of the little stone slab Yamask was holding onto. Through evolution it managed to obtain the remaining slabs to form a cool demon looking wall painting, sticking them onto its body and using them as some made up coffin like its counterpart Cofagrigus. While I’ve seen some people hate on its shiny form I think it’s one of the best ones they’ve ever made. It copies Cofagrigus’ shiny color scheme and makes it look badass. It kind of looks like the original, clean version of the dusty mural painting it normally has. The pink used really makes the painting jump to life.

It also has a cool typing in Ground/Ghost, something it shares with the Golurk and Palossand lines. Although I think Runerigus makes it work the most. It does have 5 weaknesses in Ghost, Dark, Grass, Water and Ice, meaning its types don’t balance each other out in any way, but it can somewhat dance around this with its stats. It has 3 key immunities to Normal, Fighting and Electric as well as 3 resistances, one being the very important Rock type. It might be one of the best stealth rockers in the game, being able to reliably switch in on them due to its resistance, being able to set them up and being able to block Rapid Spin thanks to its Ghost typing.

Stats wise it’s very similar to Cofagrigus. Incredible physical bulk with respectable special bulk and terrible speed. In fact the only change from Cofagrigus are its offensive stats, which are swapped around making it more of a physical attacker.

It has a unique ability in Wandering Spirit. It’s almost identical to Mummy, Cofagrigus’ ability, however instead of just overriding your opponent’s ability with this ability it swaps them around. This can make a huge difference as you can essentially steal your opponents ability upon taking contact damage. Barring you get hit by a Slaking or something that’s always a net positive for Runerigus.

Thankfully it still has access to Trick Room, allowing its terrible 30 base speed to suddenly become blazing fast. With strong stabs in Earthquake and Poltergeist and great coverage in something like Body Press, using its base 145 defense to attack with, it will have a solid performance in almost any battle. It personally carried me through some rough spots in Sword/Shield, including soloing Eternamax Eternatus for one.

Overall I think Runerigus is one of the best new designs they introduced and I love that they’re giving Gen 5 the love it always deserved.

Taking the number 10 spot of my favorite Pokémon is Gengar I've had quite the time with it on my team in competitive whether is be screwing over a stakataka with taunt then focus blast or sweeping some guy who really liked fairy types Gengar is a beloved member of my first competitive team.

Chandelure is my favorite ghost type at the moment. I haven't played much of Sword/Shield a) because of lack of time and b) because I'm not a huge fan of the direction the games have been taking. Maybe I'll actually bring myself to finish them, but who knows.

Initially I thought Chandelure's design was quite goofy, as is the case for many of Gen 5's pokemon, but it started to grow on me. And for a ghost type 90/90 defenses is pretty good when compared to its monstrous base 145 special attack stat. I have a shiny 5 IV one I bred for somewhere in my pokebank which I'm quite proud of.

2nd place for me is Gengar because of its amazing mega evolution and shiny mega form. For legendary pokemon it's definitely Giratina with its massive 150/120/120 bulk and great design. Ghost/Dragon is such a cool typing too.

.

As far as Ghost types go, I have a few favorites:

1. Chandelure
2. Aegislash
3. Mimikyu
4. Gengar
5. Trevenant and Pumpkaboo (I like them both about equally)

As for legends, Giratina is my favorite.

In all honesty though, I don't really use ghosts too often in my main playthroughs mainly because of how frail they tend to be. Oddly enough, the ghost types on my list are more on the bulky side in terms of defenses (except for Gengar of course). Chandelure is a solid 90/90, Aegislash is a beastly 140/140 (was 150 for both before the lame nerf), Mimikyu is 80/105, Trevenant is 76/82, Gourgeist is 122/75, and of course Giratina is a beastly 120/120 or 100/100 in Altered and Origin forms respectively. So yeah, while they are by no means a typing that runs on the defensive side due to usually being glass cannons, I tend to prefer those with above average defense because poor defenses and barely 100 HP at level 50 isn't fun lol.

A recent shoutout to the new Basculin evolution in Legends: Arceus. Basculegion is an absolute unit of a Pokemon and I will happily be using it on my team. I'm one of maybe like 20 Basculin fans, he is always my favorite water type to use in Unova. Not to mention he hits super hard with Adaptability boosting its water moves even further.

I have no clue what stats and ability this thing will have but I predict it's going to be bulkier and stronger. Possibly a little bit slower because it's not as streamlined as a tiny Basculin. Still, a water/ghost typing is super cool and the lore behind it is fun as well. I love that he's the Pokemon you surf on in the game, he looks so nice.