For example, if you exile a creature card, it can only be cast in your main phase when the stack is empty
If the copied creature is copying something else (for example, if the copied creature is an Evil Twin), then the token enters as whatever that creature copied, with the listed exceptions
The way they're played is to stall with Chansey while attaching a Fire Energy to Moltres every turn and then scooping Chansey up when it gets too much damage, using Wildfire, putting Chansey back down, scooping Moltres up, putting Chansey out, attaching Fire Energy to Moltres, etc
Any additional Basic Pokemon can be placed on your Bench if desired, which can support a set number of up to five backups at once
I used to watch that all the time when I was a kid