>>58016613
Swap big air balloon for a regular one, you have 3 switch outs to move metagross then just pivot back with regular balloons.
Definitely put in mew ex, it gets to abuse metagross acceleration a lot. Same with clefairy, you can completely smack dragapult match ups
You can probably cut the revaroom line, between genesect, mew and fez you have good draw to set up with. Unless the intention was to have no 2 prizers but that feels a bit clunky
3:3 cofarigus line seems too thick, you can replace some with some of the others like the ex which is baby-dragapult like this similar list I found. It gives you more routes while playing instead of being so straight forward in the strategy