Invalid Move 1 & 2, Invalid Encounter Type PID mismatch?

[DoughnutKing]

In Sword, not sure why this is happening, I'm sure Stunfisk can learn these moves.

[theSLAYER]

1 hour ago, DoughnutKing said:

In Sword, not sure why this is happening, I'm sure Stunfisk can learn these moves.

Learns Earthquake and Stone Edge via TR. You're probably missing TR flags. (hint: the Relearn Flags button)

Next up, Invalid Encounter PID mismatch. You probably made the stunfisk from scratch, or modified some of its PIDs/IVs etc.
Most Gen 8 encounters have correlated stats. You can't just edit them willy-nilly.