Whenever a newer version of a card is released, the older version follows the same rules as the new version. For example, Neo: Genesis Metal and Darkness Energy play the same as EX: LM Metal and Darkness Energy. Same thing goes with Rainbow Energy. It plays like the newest version (place 1 damage counter, not 10 damage). Mysterious Fossil, even the one from the Fossil set, has 50 HP, regardless of what HP it says to use. EXP. ALL can't be attached to a Pokémon-ex, and Here Comes Team Rocket! plays as a supporter.
Rainbow Energy provides every single type of energy all at once, but only fulfills 1 energy requirement at any given time, and does not have any other effects than merely providing energy. Scramble Energy is the same way, except it fulfills 3 energy requirements, and only works when your are behind on prizes. It also can't be attached to a Pokémon-ex or a basic Pokémon.
Hope this clears things up.