Cacnea in Emerald.
Cacnea appears in 2 places in Pokemon Emerald. The best odds are Route 111 (walking in grass or caves, 4% at level 20).
Where to find Cacnea
odds are the game's slot tablesEvolution
2 stages
Cacnea
CacturneEvolves into Cacturne at level 32.
Evolve now or wait
from the game's learnsets and the relearner ruleCacnea evolves at level 32. Nothing is lost by evolving straight away: every move Cacnea learns after that, Cacturne learns too.
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.
Cacnea learnset in Emerald
13 level-up moves · 18 machinesBy level
Cacturne by level
TMs and HMs it can learn (18)
HM01 Cut, HM05 Flash, TM01 Focus Punch, TM06 Toxic, TM09 Bullet Seed, TM10 Hidden Power, TM11 Sunny Day, TM17 Protect, TM19 Giga Drain, TM21 Frustration, TM22 Solar Beam, TM27 Return, TM32 Double Team, TM37 Sandstorm, TM42 Facade, TM43 Secret Power, TM44 Rest, TM45 Attract