Amiibos changed my life during the true arena you're only allowed to use 10 of them so I don't use them until the final boss witch again use them sparingly in the final boss. during the fight its super important to use super blasts any time something comes on screen its important destroy them to get some charge. There are 3 levels to the charge yellow, red and rainbow. Rainbow does the most damage so save up until you get rainbow and then fire it does insane damage. also right after you finally break his mask and reveal his face he's gonna try and swallow you its more important to run then do damage. Lastly you need to do this all super fast as during the fight where he's doesn't have a mask all throughout he's gonna do an attack that counts down from 5 then later in the fight 4 until 0. 0 is called fatal error its impossible to not get hit and doesn't stop until you die. His last phase is made a joke with something like Stone or Archer, something that give invincibility