Arcanine: CB only boosts attack, i think, so go leftovers or white herb overheat. protect/iron tail/hp grass are options over crunch... iron tail's bad accuracy won't be that much of a pain
milotic: yawn
zangoose: shadow ball over aerial ace, or you're screwed against ghosts. perhaps a salac over leftovers
breloom: focus punch is 100% if breloom isn't damaged on that turn, and is the perfect fit with spore. also, 2 focus punch > 3 sky uppercut. leech seed has no use; sheer power is preferable. bulk up/hp ghost and mach punch to fill up the last 2 slots.
manectric: crunch over roar, possibly hp ice/grass over light screen, your choice
weezing: will-o-wisp over haze... you don't need 2 p-hazers and 1 hazer on 1 team