How to get Deerling winter form in any non Gen 5 game?

Question

Is there any other way? I lost my black and white cartridges and black 2 is really annoying.

Answer 1

From Generation VI to VIII, with the abandonment of seasons as a mechanic, Deerling is unable to change forms.
The Summer, Autumn, and Winter forms are only obtainable via transfer from a Generation V game or from Pokémon GO.
In Pokémon Scarlet and Violet, Deerling is once again able to change forms, but the form it will become is now based on the location that the game was loaded in rather than the season.

-Bulbapedia

You need to transfer from Gen 5 to get forms outside of Spring form to get them beyond Gen 5, unless you're playing Scarlet/Violet, in which the form of a Deerling in your party will change based on where the player is when the game is loaded, with different forms of wild Deerling appearing in these locations as well. The Bulbapedia link above has more specific information about the locations.

Answer 2

Because seasons have been abandoned as a mechanic, Deerling and Sawsbuck do not change appearance, and their Summer, Autumn, and Winter forms must be transferred from a Generation V game.

source

Comments

but if you caught spring, summer, autumn or winter deerling from BW and transferring to newer games the deerling will stay on its season form?

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yes (6 characters)