What Oops All Eevees changes
How the game plays differently from Pokémon FireRed, then every stat, type and ability it alters next to what the official games do.
How the game plays
Oops All Eevees rebuilds Pokémon FireRed's Kanto with a single joke taken all the way: nothing but Eevee and its evolutions exist. Every one of the 18 types has its own pure-type Eeveelution (Flareon, Vaporeon and the rest, plus ten new ones the games never gave a type of its own — Aerieon for Flying, Artheon for Bug, Brickeon for Rock, Champeon for Fighting, Drakeon for Dragon, Duneon for Ground, Fanteon for Ghost, Ferreon for Steel, Neuteon for Normal, Vireon for Poison), and each of those can be evolved a second time into any of the other 17 types by using that type's own boosting item — the same trick as an evolution stone — giving 306 more two-type fusions on top. Kanto's map, gyms and story beats are otherwise FireRed's own, but every trainer's team is new, movesets are expanded so a type's Eeveelution always has attacks to match it, and the rival's team branches by which of the three starter-flavoured Eevees is picked at the start. A long postgame follows the Elite Four: rematches, joke bosses standing in for the game's own cast, and a final "Deadlord" gauntlet of retyped gym leaders back to back.
The main changes
- 324 Eeveelutions covering every type and two-type combination, in place of the entire Pokédex
- Every trainer in the game rebuilt with new Eeveelution teams, movesets expanded to match each type
- The rival's team branches by which starter-flavoured Eevee is picked at the very start
- Type-boosting items (Charcoal, Mystic Water and the rest) double as evolution stones for a second evolution
- Reusable TMs, Rare Candies available from the start, and a long postgame of rematches and joke boss fights
- A closing “Deadlord” gauntlet: eight retyped gym-leader rebuilds fought back to back with no healing between them
How the Pokémon change
Measured from the guide's own data, so it can't drift from the pages it links to.
Compared against present-day official data. The Fairy type and hidden abilities arrived after Pokémon FireRed, so a difference here can belong to the series rather than to this hack.
Evolution methods for all 244 species →
Base stat changes (8)
| Pokémon | What changed | Total | |
|---|---|---|---|
 | Espeon | HP 65→95, Attack 65→80, Sp. Atk 130→150, Sp. Def 95→110, Speed 110→130 | 525→625 |
 | Flareon | HP 65→95, Attack 130→150, Sp. Atk 95→110, Sp. Def 110→130, Speed 65→80 | 525→625 |
 | Glaceon | HP 65→80, Defense 110→130, Sp. Atk 130→150, Sp. Def 95→110, Speed 65→95 | 525→625 |
 | Jolteon | HP 65→80, Attack 65→95, Sp. Atk 110→130, Sp. Def 95→110, Speed 130→150 | 525→625 |
 | Leafeon | HP 65→95, Attack 110→130, Defense 130→150, Sp. Def 65→80, Speed 95→110 | 525→625 |
 | Sylveon | HP 95→110, Attack 65→80, Defense 65→95, Sp. Atk 110→130, Sp. Def 130→150 | 525→625 |
 | Umbreon | HP 95→110, Attack 65→80, Defense 110→130, Sp. Def 130→150, Speed 65→95 | 525→625 |
 | Vaporeon | HP 130→150, Attack 65→80, Sp. Atk 110→130, Sp. Def 95→110, Speed 65→95 | 525→625 |