When Terapagos enters the battle, it turns into its Terastal Form until the end of the battle.
Tera Shift cannot be copied by Trace, Power of Alchemy, or Receiver. Tera Shift cannot be replaced by Lingering Aroma, or suppressed by Neutralizing Gas.
In Auto Battles, Terapagos will first change into its Terastal Form before attacking the wild Pokémon.