To get the Pokemon TCG Pocket Mew card, as mentioned above, you need to complete the Kanto Pokedex, which means getting at least one of every of the original 150 Pokemon in the game. Once you do so, an option will come up in your "missions" tab to complete the quest and reward you with the Mew card itself, like any other mission reward.

Some packs in Pokemon TCG Pocket are presented backwards from the get-go, but does that mean they have better cards?

It’s midnight. The room is pitch black. I gingerly creep into bed so as not to disturb the amorphous blob of children that may be residing somewhere near its center. I’m sleep-deprived but unable to turn my brain off.