Since Scyther can fly in the show(I think), you can put it adjacent to the arcanine, a bit higher too. A gyarados would fit better in the background, if you were to put water in the back (an ocean or something) you could fit water PokeMon and such.
I'm going to second this. I'm liking what OP is doing already and I think he will cover everything once more PokeMon are added and he edits his videos for them. We're going to be in for a thrill ^_^
I'll be simplistic and I won't waste your time.
My name's Sean, I'm 17 and I have a lot of experience from other communities.
I'm sorry if I ask or suggest anything that's already been answered or suggested, I'm new here and I really don't want to lurk an entire forum to see if I can ask a question.
See ya around everyone!