From StrategyWiki, the free strategy guide and walkthrough wiki

Victory Road is an incredibly challenging path that tests your true potential to defeat the Pokémon League. By the way, if your Pokémon cannot beat the trainers or wild Pokémon in Victory Road, then you definitely need to pull out and level up more.

[edit] HMs needed

• HM06: Rock Smash
• HM04: Strength
• HM03: Surf
• HMO7: Waterfall
• HM08: Rock Climb

[edit] Items Found

• TM59: Dragon Pulse

[edit] Pokémon Encounters

• Machoke
• Golbat
• Onix
• Steelix
• Kadabra
• Medicham
• Graverlar