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.
The fist 2 are easy! But the 4th one's hard (for me): wait for a pattern to come - like the other one's once u get through the second door it LOOKS like the alerts are over...but it isn't!! This one's like the 2nd one..almost; u need to be aware of this pattern BEFORE you move!