I found a bug with the Pokedex entry of Meowstic: Yesterday, I caught a female Espurr and evolved it to Meowstic-F. However, I neither got the Pokedex entry for Meowstic, nor the evolution entry. I think the reason for this is that I already had Meowstic-M in my Pokedex "seen" data for Pokedex number 678. Probably, the game has Meowstic-F and Meowstic-M implemented as two different Pokemon, but only the one you have seen first will appear in your Pokedex. That means that the only way for me to get both the Pokedex and evolution entry for Meowstic is to catch a male Espurr and evolve it.