I generally spread out my HM's for my in-game team and then use slaves when I want to start competative battling.
My team will go like this in game:
Typhlosion - rock smash/flamethrower, eruption, focus blast, earthquake.
Pidgeot - Fly, return, steel wing, pursuit.
Donphan - Earthquake, assurance, stone edge/strength , ice shard.
Ampharos - Flash/focus blast, power gem, signal beam, thunderbolt.
Scizor - Cut, bullet punch, brick break, x scissor.
Blastoise - Surf, waterfal/earthquake, whirlpool/hidden power, ice beam.
:)