Shouldn't my attack and speed still be at +1? I thought that +1 and -1 bonuses don't decrease towards 0, it's only +2 and -2 that decrease.

Alright, this strategy will be somewhat harder to pull of but we can do it, let the Bide hit yourself and instead
Dragon Dance for some extra speed and power, then use
Protect on the Confuse Ray, finish up by killing Rokon with
Scald