The Mighty Porygon2 isn’t a difficult fight, but there are a few things to be aware of before heading into the black tera raid den. Porygon2 will start the battle by setting up Trick Room, which reverses the speed order (slower Pokémon will act first). It will also use moves that have a chance to cause a status effect, especially Tri Attack since it can freeze, burn, or paralyze your Pokémon. Trainers can get around this by using heal cheers or negate it all together by using the Covert Cloak item.
Tera Type: 
Moves:
Tri AttackPsychicThunderboltIce Beam
Example Builds to Beat this Raid
Held Item:
Metronome
Ability:
Defiant
Tera Type: 
Nature:
Adamant
EVs:
4 HP 252 Atk 252 SpD
Moves:
Focus EnergyDrain Punch
Held Item:
Covert Cloak
Ability:
Sharpness
Tera Type:
Nature:
Careful
EVs:
4 HP 252 Atk 252 SpD
Moves:
Sacred SwordSwords DanceLight ScreenDrain Punch
Held Item:
Covert Cloak
Ability:
Quark Drive
Tera Type:
Nature:
Adamant
EVs:
252 HP 252 Atk 4 SpD
Moves:
Drain PunchBelly DrumElectric TerainDetect
