I have been discussing this issue with someone, and we have different interpretations on what this ruling in the EX Ruby & Sapphire rulebook actually means. I think it means that I could use the effect of a Stadium card already in play, then play a Stadium card from my hand to remove the old stadium, and still be able to use my new stadium's effect. (This would agree with a previous, old ruling on Healing Fields, allowing you flip for the original Healing Fields, play a new Healing Fields for your hand, and still be able to flip again for a new Healing Fields.) The other person believes that it means that you can't play 2 stadiums on the same turn, and you can't use the effects of 2 different stadiums on the same turn. The other person also says that this interpretation complies with the Japanese rules prohibiting both of those actions. Which line of thinking is correct, or are we both a little off-track? Thank you in advance for any help you can send our way.