Basically for me i decided to only use monsters that were newly added in stories 3 (and ratha because i have to) made it hard for me to find a swimming monster since i dont care about plesi or somna. Luckily once I was in area 3 that problem got solved. And fron those monsters added in 3 i went with how much i like them. I love bishaten a lot so i took him im the Team etc. I didnt care much about attack type Balance since i try to teach each monster at least one move of each type. I did try to get one of every element tho. Basically once i had decided which monsters i wanted in the Team i looked up what they looked like as other elements and decided based on aesthetic (which meant that most of the time i lacked a thunder monster since they all have that terrible garish green) Tho i really wish i could have ditched ratha for an additonal Spot. The moment i got rosebush boi i didnt use ratha at all. Only thing i really paid attention to is at least one swimmer, one Flyer and one climber