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Which turns out to only be Smeargle I was very sad when i realized.

I did a mono-normal run (ab)using rainbow field, and it was really fun. I had Castform to set rain/sun for the rainbow field, Porygon (and later porygon 2) with charge beam and tri-attack, Audino as a wall and pivot, Exploud as a special attacker, Loppuny to baton pass cosmic powers, and Cincinno for a physical attacker and coverage. There are plenty of other options as well, such belly drum Linoone, Persian (technician fake out), Heliolisk/Pyroar, and the plethora of normal/flying types.

The main question is does weather ball get boosted from 50 BP to 100BP in a rainbow field when there is weather? The relevant effects of rainbow field on weather ball: Weather ball damage * 1.5, special normal moves * 1.5 and receive a random typing. As we know, weather ball, in weather, changes from 50 base power to 100 and changes typing. Sans rainbow field, a Castform weather ball is 100 BP * STAB * Weather effect (e.g. 50% fire boost in sun), making it a potentially 225 power move. With testing in rainbow field, I found that Weather ball's typing is no longer determined by weather; it seems to have been overridden by the field effect of a random typing (e.g. weather ball in sunny getting not very effective on Carvine and Pidgey). Since weather ball is treated as a normal type move, does it even get boosted from 50 BP to 100BP in a rainbow field? The worst case scenario is weather ball does not get boosted to 100BP, and just gets the 50% field boost and 50% boost to normal special attacks, making it 112.5 power and probably no weather or STAB boost. In this case, weather ball is actually much worse in a rainbow field than out. If weather ball does get to 100BP, it is still at 225 power, but without predictable typing. Ideally, weather ball should be counted as a none-normal move when used in weather, so it just gets the 50% move specific boost on top of its 225 power (and lose the 50% boost to normal moves and random typing).