Type chart
Pick a type to see who it hits hard and who hits it hard. It's the usual chart with one change: in PokéDive nothing is immune, so what "has no effect" in the main series only hits weakly here.
Normal
Fire
Water
Electric
Grass
Ice
Fighting
Poison
Ground
Psychic
Bug
Rock
Ghost
Dragon
Dark
Steel
Fairy
With two types, both are combined: an advantage and a weakness cancel out.