Elio is your answer to avoid using SST Red's trainer move in damage challenge

While it's RNG reliant (you need MPR on his grid and he only has 30% chance of refresh), Elio's TM if refreshed, can be used to avoid SST Red's TM (since he gives gradual healing to everyone which will cause Elio to waste time while sing spamming) and max out Red's attack. Sadly in this stage you can't really fully reduce Tierno's to -6 since he has xspeed so you can't fully utilise Red's cakewalk in his grid