Hmm good question! I like all of Mika's parties a lot because they are from my main adventures, maybe Mika (Johto) or Mika (Alola) 
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Hollow Omega
MemeSelf
Mine the Kanto one (even thought Feraligatr isn`t Kanto).
Hollow Omega
Oh, but that's because it's from my Soul Silver adventure. In the end of the game you unlock the Kanto region, I only took Feraligatr with me and captured a new team of Kanto Pokémon.
Hollow Omega
Feraligatr is my main partner in the majority of Mika's adventures, hence why he's in most of the trainercards. I'm also glad you like it!