Pokémon Ranger/Hideout Infiltration!
From StrategyWiki, the video game walkthrough and strategy guide wiki
You need to capture Altaria on your way to the Hideout. Then you must capture Charizard (he has 15-16 loops now). Capture the Aerodactyl and Cloyster on your way there (Go-Rock Squad sets this up for you). Capture two Tangela, then go across the waterfall with them and recharge your styler with Pichu or Pikachu. From there, go up the rocks (avoiding the Gligar!), release any friend Pokémon and go in.
Hideout Infiltration
Once you get in the hideout, you'll see Chris is there already. He gives you some advice then leaves. Be warned that once you're inside, there's no way out. The alert system's easy – just wait for a pattern to come.
