Most companions are tuned to work well with their respective Doctor, but thanks to the Doctors companion ability that many of them share, you can mix and match them as partner commanders
While there are better options for this type of effect, having one stapled to your commander is always handy in a pinch
However, since all of their cards are cheap, aggro decks can hit the ground running and win the game before their opponent can even get started
The fact that the deck has several non-halfling creatures like elves, humans, and treefolk all works really well in my opinion
Getting cards for your favorite Pokmon
Flareon would slowly disappear into the background for the next year of Standard, but would remain a snowballing force to be cognisant of if an Eevee was ever played down