Step 1: Go to the bridge close to the Gurdurr's crew. Step 2: Walk from above the bridge to the left side. Step 3: Run back to the bridge and go fast to the Gurdurr's crew. If you do this perfectly, your partner can't go to you and after a few seconds he walks away and that is your chance to run away. (don't get to close to your partner!) Now you're Walking alone! (only in that place and if you talk or check something he will run extremely fast to you so becarefull!!!)
First, have a huge paradise. Then go to companion mode and run around until you find a strange Pokemon who you don't have. Get what she needs and she will build you a facility. Then she will join your team. I won't tell you the facility because I want to surprise you.....SURPRISE!!!
Before I tell the cheat, there are requirements. First, be pikachu. Have him learn thunder wave and thundershock. When you approach a sleeping Pokemon,use thunder wave. It will still be asleep but paralized. You can slip past it or destroy it with no problem