Treecko in Emerald.
Treecko is a starter in Pokemon Emerald: Professor Birch offers it at level 5 at the start, and it appears nowhere in the wild.
Evolution
3 stages
Treecko
Grovyle
SceptileEvolves into Grovyle at level 16.
Evolve now or wait
from the game's learnsets and the relearner ruleTreecko evolves at level 16. Evolving then forfeits 2 moves that Treecko would still learn: Mega Drain at 26, Giga Drain at 46. Grovyle learns 2 moves of its own after that: Leaf Blade at 29, False Swipe at 53.
| Move you would forfeit | Level | Can you get it back? |
|---|---|---|
| Mega Drain | 26 | No. The Move Relearner only teaches moves from the current form's own level-up list, so once it is Grovyle this move is gone. |
| Giga Drain | 46 | Yes: TM19 Giga Drain teaches Grovyle. |
Rule the game applies: the Move Relearner in Fallarbor Town (he takes a Heart Scale) teaches only the level-up moves of the form you hand him, at or below its current level. Delaying an evolution costs the evolved form's higher base stats for every level you wait; a move you barely use is not worth that.
Treecko learnset in Emerald
11 level-up moves · 25 machinesBy level
Grovyle by level
TMs and HMs it can learn (25)
HM01 Cut, HM04 Strength, HM05 Flash, HM06 Rock Smash, TM01 Focus Punch, TM06 Toxic, TM09 Bullet Seed, TM10 Hidden Power, TM11 Sunny Day, TM17 Protect, TM19 Giga Drain, TM20 Safeguard, TM21 Frustration, TM22 Solar Beam, TM23 Iron Tail, TM27 Return, TM28 Dig, TM31 Brick Break, TM32 Double Team, TM39 Rock Tomb, TM40 Aerial Ace, TM42 Facade, TM43 Secret Power, TM44 Rest, TM45 Attract