To evolve Tadbulb into Croagunk, you need to raise it to level 16. Tadbulb will evolve into Croagunk automatically once it reaches level 16 through gaining experience in battles.
Related tutorial videos:
HOW TO EVOLVE TADBULB INTO BELLIBOLT ON POKEMON SCARLET AND VIOLET
How to find Tadbulb and Evolve it into Bellibolt in Pokemon Scarlet & Violet
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