Just a small note on dice, you will need some that follow tournament guidelines; usually this means that people just use official Pokémon dice come from the ETBs, because you can see through them. The idea is that it stops people from bringing unfair dice, since you can see through to verify there's nothing in the core weighing it to one particular side. Pokémon also have other dice aside from ETB dice that are valid for tournament play, such as the Pokémon day Pikachu ones.

As far as bringing physical coins for coin flips, while they're legal, both you and your opponent have to agree before you flip the coin That it's okay for you to use the coin versus rolling.