GENTLE NATURE CALCULATOR
Natures weren't part of the series until Generation III (Ruby & Sapphire), so Crystal doesn't have them. Every stat is calculated from base stats, IVs (called DVs back then), and Stat Experience alone. If you're looking for the Gentle nature's stat effect, switch the game filter above to any Gen III or later title. That said, the concept still helps with planning teams for remakes like FireRed & LeafGreen or HeartGold & SoulSilver, where natures do apply.
BEST GENTLE NATURE POKEMON
Gentle trades Defense for Sp. Defense. Losing physical bulk is rough for a wall, so this only works on Pokemon that already have high Defense or rarely take physical hits. In Crystal, You'll see it on Noctowl, Machoke, Drowzee among others. Crystal has no nature system. Transfer your Pokemon forward and breed for Gentle in a modern title.
| # | Pokemon | Tier | Role | Ability | +SpD | -Def | Spe |
|---|---|---|---|---|---|---|---|
| 1 |  Noctowl NORMAL | C | Bulky Support | Insomnia | 96+14 | 50-7 | 70 |
| 2 |  Machoke FIGHTING | C | Physical Tank | Guts | 60+11 | 70-9 | 45 |
| 3 |  Drowzee PSYCHIC | C | Bulky Support | Insomnia | 90+14 | 45-7 | 42 |
| 4 |  Sentret NORMAL | C | Bulky Support | Run Away | 45+9 | 34-6 | 20 |
| 5 |  Vulpix FIRE | D | Utility | Flashfire | 65+11 | 40-6 | 65 |
GENTLE NATURE GUIDE
- Pokemon that need to check physical threats (use +Def)
- Pokemon that need to check special threats (use +SpD)
- Walls and tanks that rarely attack
- Defensive Pokemon that still need attacking power
- Pokemon that run both physical and special moves