1. When pikachu's really mad, he'll have a skull (I think) over his head, and he'll look like he's doing thunderbolt. When he's happy, he will jump up and down.*

2. Jump over a ledge, but don't let pikachu come off it. He will become unpatient and he will do various things after a while.

3. While you do #2, sometimes if you walk forward while he's doing that, sometimes he'll slide after you.

* I meant the maximum mad and happy.