I love using my Mirror Strider when fighting Farmer Nishi. I have been able to consistently level two other pets when using my Mirror Strider . I love using the pump ability. I am able to consistently kill the sunflower and the turnip that way. I always put the 2 low level pets in when the sunflower...
Pretty much the only pets I don't collect are the ones I cannot get. Anything outside the US and the horde only pets. I still check ebay for the TCG pets and original CE, but those are always so expensive.
I'm pretty sure my first pet was one of the cats from Elwynn. Then I found out about the white kitten and I just had to have it! I still wish my first pet was the panda though!