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Supporter cards from Diamond & Pearl through Call of Legends should be considered Trainer - Supporter

There is also the Background mechanic, which seems like a way of fixing Partner as Backgrounds don't do anything unless a commander is on the field

What kinds of cards are being introduced

Keep your Pokmon cards protected by placing them in card sleeves and storing them in a binder or box

June 1 - July 31, 1999 All Nippon Airways Everyones Happy Campaign first half begins June 15, 1999 CoroCoro Comic s July 1999 issue is published with a promo card June 25, 1999 Challenge from the Darkness (Gym Challenge internationally) expansion is released in Japan June 30, 1999 Bessatsu CoroCoro Comic Special s August 1999 issue is published with a jumbo promo card JUN June 1999 Wizards of the Coast begins Year 1 of the Pokemon League at stores nationwide