Ground matchup changes across generations
Ground's type-row answers stayed recognizable while later generations added ways to bypass or restore its immunity.
- Generation I: Ground attacks were blocked by Flying and were super effective against Fire, Electric, Poison, Rock, and the original chart's other listed targets.
- Generation II: Steel was added as a type that Ground attacks hit super effectively, giving Ground a new high-value target.
- Generation III: Levitate introduced an ability-based Ground immunity that is separate from the Flying type.
- Generation IV: Magnet Rise allowed a non-Flying Pokémon to become immune to Ground temporarily, while the physical/special split changed how Ground moves were assigned.
- Generation V onward: items, moves, and abilities continued to create grounded and ungrounded states without changing the base Ground row.
That history explains why a Ground calculation needs the type chart plus the active ability, item, or field state.