Okay well you said you know the battles so I can't help you with those. With Deyoxs quiz everyone is waiting for Chainsaw to make how to translate her speeach avilable before we fight her so we can figure out her quizes easier. As for the Celebi chase since she takes you through time the first place she takes you is Cerluan Cave where you have to climb the maze walls to get to MewTwo and the second place is the tower you catch Rayquaza and you need to use your wings. If I had more info on where you have trouble and keep lossing Celebi I could tell you the needed "tool" to pass it. Again as for the battles what I usually do is just back up if I mess up and then click forward so I can try again. Besides that idk how to help as even the way tobuse the battle moves doesn't help as the word clues we need to look for tend to be in each attack so I'm hoping Chainsaw can provide more context clues for those.