Well since I can allow Mega Evolution, for Phoebe i'm probably going to go with Mega Gyarados, which can learn Taunt. And the other three E4 members you have my strategies right, but for Steven we'll have to see what I go with. Although I am mildly scared about Wally, though, but we'll see how things go with him.
And not sure if you saw the blog I made yesterday, but Marriland's secondary Twitter followed me - I told him about what happened with my pair, and, well...i'll let you read the blog and see the rest for yourself. :)