A Match consists of 3 Characters each having 3 stocks on each side and ends when one sides runs out of stocks.
You are character locked once you get started. When you lose a game / run out of stocks on a character you must choose another of your remaining characters and they will start at 3 stocks.
Your opponent will start with however many stocks was remaining on the character they won with.
No Echoes are allowed on your team, that includes Roy/Chrom.
Starter Stages
Pokemon Stadium 2
Final Destination
Battlefield
Smashville
Town and City
Counter picks
Small Battlefield
Yoshi's Story
Kalos