The "F" and "L" were, well, taken from the internal track list. I don't actually know the context in which they play, but seeing as I found vaguely what they were, I decided to name them the most logical thing.
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4AB can be named "Deep in Team Plasma's Ship" or something along those lines.
The final showdown with Team Plasma is, to say the least, shocking. Probably the game's defining moment. A certain villain reappears, and does something considered taboo in the Pokémon universe, leading to some great 3D cutscenes and two rather trippy battle themes.
Oh, and Black Kyurem refused my Master Ball. You find out why, but...still.