[Other] Trying (and failing) To Add a New Evolution Stone to Emerald

[MrMuggles]

First time poster, hi \o

So I'm trying to do what's probably been done a thousand times over already and make a version of Emerald able to be completed without interaction with other games. As part of this, I'm trying to replace the trade evolution methods with a stone evolution using a new evolution stone I've named "Link Stone". When I assign this as the evolution method though - on Kadabra for example - despite showing in the party that I could use the stone on the Pokémon, when I actually try to use it on the Pokémon it comes up saying "It won't have an effect".

For the purposes of testing, I assigned the Leaf Stone as the evolution method instead, and it worked without problem.

I was wondering if anyone had any insight into what I might be doing wrong which is preventing the new item from working.

Any help would be much appreciated :)

 

[Dr. Seuss]

Evolution stones need a extra setup to work. You can follow this tutorial with the answer of your question.

 

[MrMuggles]

Thank you Dr Seuss! This is exactly what I needed.

I appreciate the help, thanks for pointing me in the right direction!