Hi I've came up with a guide. Here it is:
Before tournament:
Know your opponents, look at their favorite bey on their page that will most likely be what they will use the most in battle.
Don't over-practice, if you do your bey will be worn down by the time the tournament starts.
Make a team, having different beys for your opponent is good
During tournament:
Make sure you bring all the stuff you needed (you never know what can happen)
Practice when you aren't battling for real, this will build skill
MOST IMPORTANT RULE: DO NOT UNDER ESTIMATE ATTACK TYPES (they are really good)
Before tournament:
Know your opponents, look at their favorite bey on their page that will most likely be what they will use the most in battle.
Don't over-practice, if you do your bey will be worn down by the time the tournament starts.
Make a team, having different beys for your opponent is good
During tournament:
Make sure you bring all the stuff you needed (you never know what can happen)
Practice when you aren't battling for real, this will build skill
MOST IMPORTANT RULE: DO NOT UNDER ESTIMATE ATTACK TYPES (they are really good)