We really can't answer this question.
A bunch of base stats have already been added, but they are just estimates, and it will take a while for them to find the movesets and stats of everying, as well as a lot of work.
Lucario, blaziken and charizard don't really change besides the abilities and stat boosts. The stat boosts already boost the stats that you would normaly ev train them on, so I would reccomend ev training them on the stats you would normally train them on. For charizard though, train it in special attack if its mega charizard Y and train it in physical attack if it is mega charizard X.
For movesets, be creative. Not everything has to be from other people. Choose the moves you think would be best and develop a good strategy.
But for base stats and the moves they learn by leveling up, we just have to wait for a few more weeks.