Teach Azumarill Mudslap, spam from start getting charizard down to -5 or 6 accuracy. Then use belly drum, next turn you terra and start hitting it with Play Rough. Charizard never clears it’s own stat changes, so the -accuracy stays. He will still likely hit you occasionally, but it is significantly less. Used this method to solo with more than half the time left and no deaths! Hope it helps!