You can't.
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There is no such thing as Pokemon "MODE", but there is a pokemon "MOD" which you can install.
Download the mode or change the play mode to creative.
If you install a mod it will work in all gamemodes.
Every major update to Minecraft the id's on some items change. Go to the the MinecraftWiKi and they will have the updated list. Or you can change your mode from survival to creative mode and just use the item you want.
You can crack it by go to server properties and change to offline mode there you go.