In my perfect world, the typings for the three would be...
Rowlet -> Grass/Flying: Don't change a thing. We need more Grass/Flying types. BUT, if it has to change...
...........-> Grass/Rock: People keep speculating that it will lose its ability to fly as the owl Rowlet is based on could be flightless. If so, I'd prefer Grass/Rock over Grass/Ground. Grass/Rock is relatively unique AND awesome offensively. PLUS, imagine if it got the Hidden Ability Levitate (as a means of representing that some Rowlet final evolutions maintain their flight). I'd be in Heaven.
Litten --> Fire/Ghost: Farfetch'd, I know but I want an awesome Fire/Ghost...I mean, Chandelure was cool but not quite my style. I participate in Pokemon battles and contests so having a sleek, ghost tiger would be purrfect (sorry for the bad pun).
.........--> Fire/Ground: Imagine a speedy Camerupt. 'nuff said.
Popplio ---> Water/Fairy: Fairy is my favorite type. While I've been a fan of Pokemon since the original Red and Blue, I've never been able to pick just one type I loved most (Fighting or Dragon were the closest). But, with Fairy, I fell in love. So, having a Fairy Starter would be amazing or me. Yes, Azumaril is already covering the Water/Fairy gambit, but perhaps Popplio's final evo could bring something new to the table.
...........---> Water/Fighting: Simply because we have so few of the typing.
Rowlet -> Grass/Flying: Don't change a thing. We need more Grass/Flying types. BUT, if it has to change...
...........-> Grass/Rock: People keep speculating that it will lose its ability to fly as the owl Rowlet is based on could be flightless. If so, I'd prefer Grass/Rock over Grass/Ground. Grass/Rock is relatively unique AND awesome offensively. PLUS, imagine if it got the Hidden Ability Levitate (as a means of representing that some Rowlet final evolutions maintain their flight). I'd be in Heaven.
Litten --> Fire/Ghost: Farfetch'd, I know but I want an awesome Fire/Ghost...I mean, Chandelure was cool but not quite my style. I participate in Pokemon battles and contests so having a sleek, ghost tiger would be purrfect (sorry for the bad pun).
.........--> Fire/Ground: Imagine a speedy Camerupt. 'nuff said.
Popplio ---> Water/Fairy: Fairy is my favorite type. While I've been a fan of Pokemon since the original Red and Blue, I've never been able to pick just one type I loved most (Fighting or Dragon were the closest). But, with Fairy, I fell in love. So, having a Fairy Starter would be amazing or me. Yes, Azumaril is already covering the Water/Fairy gambit, but perhaps Popplio's final evo could bring something new to the table.
...........---> Water/Fighting: Simply because we have so few of the typing.