I wanted to do a Pokemon theme team based around Trixie but the problem comes when not a lot of Pokemon fit best pony all to well. Maybe I'm not looking at the right reasons. So far I have Zoroark and rapidash

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Well a team that might be useful in a performance or a magic act would help narrow the choice down. Ditto is one that comes to mind, as it could transform to perform elaborate tricks for her.

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Not a bad idea

Mismagius is magic-themed, as is Braixen/Delphox.

Zoeoark (double body trick)
Alaskam (teleportation tricks)
Incineroar (hecklar that hangs out in the crowd, talks)
Staryu ( in case of fire plus with how it floats around she can boast magicless levitstion)
Gothitelle (assisitant)
Gengar (illusion mastery)

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Wouldn't Zoroark be better for illusion magic as,it is the illusion Pokemon?

Why not both?

mew is master of illusion
but I could see Trixie in https://pokemon.fandom.com/wiki/Pok%C3%A9mon_Showcase