To get a shiny teddiursa would be brilliant. It is very hard to find. The best way to get a shiny is through chaining. You need to beat the Elite 4 and get PokeRadar.
Chat with our AI personalities
In route 211, use pokerader.
...shiny Pokemon are always shiny... ._.
On Action Replay press disable Shiny Pokemon.
Teddiursa's brown-orange fur is replaced by a light shade of green in its Shiny version. All the other colors remain untouched. You can check the related link below for an image of a Shiny Teddiursa.
yes you can get shiny Pokemon with action replay