Thunder, always loved the animation and it's so strong. I hate when it misses but when it hits with a good thunder Pokemon lights out
This was always an awesome combo. On the flip side: Rest + Sleep Talk was also pretty nice.
In the original Game Boy games, Bubble Beam. It has such a hardcore animation. It's so metal. It's the first one in this video, which also showcases how progressively lamer it got over time:
It's not as good in Generation II, but it's still softer. Nothing compares to the brutality of that first-gen version of the move. It's radical.