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You know what grind my gears? These 3 are a stepdown compared to Kanto and Hoenn starters. Any of the 3 Kanto starters will be a good choice regardless. But these?
Cyndaquil is picked more for the fact that Fire pokemon are pretty damn niche in Johto. Totodile, while picked, compete with a bunch of good water types in the pokedex that you probably want to add and Chikorita isn't good, let alone unique since you can just catch a Bellsprout and actually do well. There are other good Grass pokemon, despite the type overall not being used.
To me nothing about this trio feels exciting, special, like the Kanto or Hoenn starters do. But I really want to actually get excited for them because Johto games are amazing.