Numbered editions were simply reprints of the original Alpha cards like Grizzly Bears, Lightning Bolt and Counterspell, similar to what Core Sets used to be
If one of your Traps isnt quite what you need right now, use Akasuna the Battle Ashtra to send it to the Graveyard to flip all your opponents monsters face-down
There are three Game Boy Color-exclusive cards: the aforementioned Ditto, a Dragonite with the Healing Wind power, and an Articuno with the Quickfreeze power
There are 6 starter decks available, 1 for each of the different factions, and I definitely recommend picking up at least one of these to get you started
The deck benefits from Erika heals, while Beedrill can be a nightmare for energy hungry Pokmon, and Meowscarada can really punish Exs