Encounter locations
| Region | Location | Method | Level |
|---|---|---|---|
| Sinnoh | Route 222 | Overworld swarmOnly while this swarm is active | 27–33 |
This Pokémon is eligible for Mirage Rifts. Each opening rolls its own pool, so check active portals on the Town Map.
Check the Town Map to see which swarms are active.
This guide covers documented encounter tables and selected story events. Other scripted gifts or events may also award this Pokémon.
Natures
Randomly generated Pokémon can have any of the 25 natures. Twenty raise one stat by 10% and lower another by 10%. Five are neutral. HP stays the same.
View all 25 natures and stat effects
| Nature | Raises (+10%) | Lowers (−10%) |
|---|---|---|
| Hardy | — | — |
| Lonely | Attack | Defense |
| Brave | Attack | Speed |
| Adamant | Attack | Special Attack |
| Naughty | Attack | Special Defense |
| Bold | Defense | Attack |
| Docile | — | — |
| Relaxed | Defense | Speed |
| Impish | Defense | Special Attack |
| Lax | Defense | Special Defense |
| Timid | Speed | Attack |
| Hasty | Speed | Defense |
| Serious | — | — |
| Jolly | Speed | Special Attack |
| Naive | Speed | Special Defense |
| Modest | Special Attack | Attack |
| Mild | Special Attack | Defense |
| Quiet | Special Attack | Speed |
| Bashful | — | — |
| Rash | Special Attack | Special Defense |
| Calm | Special Defense | Attack |
| Gentle | Special Defense | Defense |
| Sassy | Special Defense | Speed |
| Careful | Special Defense | Special Attack |
| Quirky | — | — |
Stats and abilities
- HP
- 59
- Attack
- 45
- Defense
- 50
- Sp. Attack
- 40
- Sp. Defense
- 50
- Speed
- 26
Abilities · Ball Fetch
Hidden ability · Rattled
Evolution and forms
- Into Boltund · Level 25
Level-up moves
View level-up moves for Yamper
| Level | Move |
|---|---|
| 1 | Tackle |
| 1 | Tail Whip |
| 5 | Nuzzle |
| 10 | Bite |
| 15 | Roar |
| 20 | Spark |
| 26 | Charm |
| 30 | Crunch |
| 35 | Charge |
| 40 | Wild Charge |
| 45 | Play Rough |