✧ Normal Effectiveness is the regular type style while Inverse Effectiveness inverts the regular type chart, turning immunities and resistances into weaknesses, and weaknesses into resistances.
✧ If you want to check the type chart, use the Pokémon Deluge's Normal Type Chart and Inverse Type Chart.
✧ Type effectiveness greatly influences how much damage moves deal
Damage normally - Normal Damage (x1).
Weak to - Effective (x2) and Super Effective (x4).
Resistant to - Endure the damage (x1/2) and (x1/4).