Why can't I progress in Team Rocket's Castle?

Question

I've defeated Lysandre in Team Rocket's Castle, and then I pressed the button to open the portal door. But the portal is still solid gray, even though it's green when I look on YouTube.

Please help. I've tried soft resetting but I really don't want to reset my game progress to fix this.

Comments

I understand this is a repost -- I'll let it fly now and just take down the original, but for future reference, please don't repost the same thing if you don't get the answer you wanted. Communicate with the person who answered your question first.

Answer 1

You need to defeat both Cyrus and Lysandre to progress. Cyrus can be found at the end of the spin tile puzzle in the northwest wing of the castle.

Be warned: when you try to step through the portal, you will have to battle Ghetsis to continue.

Team Rocket's Castle (Bulbapedia)