yes they are found at limit valley
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You should ask more detail. You can find Koromon in Digimon Adventure, Digimon Adventure 02, Digimon Frontier, Digimon Savers/Data Squad, Digimon Adventure V-Tamer 01, Digimon Next, Digimon Virtual Pets, Digimon World DS by either get it by choosing him as starter or degenerate DotAgumon, Digimon World Dawn/Dusk, Digimon World Championship, Digimon RPG, and Digimon Masters.
you need a T.F.U. it turns your captured or partner digimon into agumonx use it on koromon and it turns into agumon x
Buy it with WeCash unless WeMade do another koromon Rental
It depends on the game and the Digimon you want him to evolve into. Examples: in Digimon World DS he evolves into Agumon at level 6, but in Dawn/Dusk he reaches this form at level 7. In the former he is able to evolve into ToyAgumon, while in the later this option doesn't exist.
In order to get a Digimon's aptitude up in "Digimon World Dawn," you would have to degenerate your Digimon to a Digi-Egg.