What do you guys think of my SoulSilver team using only Johto Pokémon?

Girafarig
-Energy Ball, Calm Mind, Psychic, Zen Headbutt
Twisted Spoons
Lax Nature

Heracross
-Megahorn, Brick Break, Swords Dance, Close Combat
Wide Lens
Adamant Nature

Houndoom
-Flamethrower, Dark Pulse, Nasty Plot, Overheat
Wise Glasses
Lonely Nature
FLASH FIRE

Lanturn
-Rain Dance, Brine/Surf, Thunder, Ice Beam
Damp Rock/Leftovers
Modest Nature
VOLT ABSORB

Skarmory
-Spikes, Steel Wing, Fly, Rock Slide
Leftovers
Quiet Nature
STURDY

Mamoswine
- Earthquake, Avalanche, Amnesia, Ice Fang
Rash Nature
Nevermeltice/Leftovers
OBLIVIOUS