If meow does not have spikes support pex can wall it, so you dont have to terastallize alomomola. If you are facing Spikes + Meow + Hatterene, you should terastallize Alomomola and try to not mess up against Hatterene. Remember that Psychic Tera is only for emergencies vs Hatt and that most of the time you should be able to wall it withouth Tera. Spam Haze with Toxapex until they reveal their psychic type move. If Psyshock dondozo walls, if Psychic, Blissey can spam Seismic Toss.