Well I have a good team but I only have 5 members witch are gyradoes level 36 charizard level 36 clefable level 36 pikachu level 20 and pidgeoto  level 36 any ideas for number 6 I am on badge 5

Maybe get a Pokémon that can use ground moves. So Onix, Dugtrio, and using the Ditto glitch to get Golem would be good choices.

What is the ditto glitch can you please tell me also thx I was thinking about a muk or other fire type but I well need ground to help

llollya :
Not sure what the ditto glitch is, but as for your final member, I do not think you will want another fire type. To be honest, half your team so far has a weakness to electric type moves (Charizard, Gyarados, and Pidgeotto all have Flying type in them, plus Gyarados is water type too). I would go with Dugtrio in this version for a nice ground type with no double weakness to water and grass.

If you want something different, though, maybe a Hypno for some psychic power (I would say Alakazam, but you cannot trade him for his evolution on the Rom), or perhaps a Vileplume or Victreebell for grass types that also resist electricity.

For me, personally, I might ditch Pidgeotto (despite him being my favorite Pokémon), give Charizard the fly ability instead, and add in Vileplume and a Dugtrio for some balance. That way, the team would have Fire/Flying, Water/Flying, Electric, Normal, grass/poison, and ground... Though I might get rid of Vileplume in favor of Hypno since psychic types tend to be pretty good. I suppose it depends on how you built your Clefable.