Do you retain the characteristics of your base type(s) when terastallized?

Question

So essentially I want to know if your Pokèmon become purely their tera type when terastallized or if they keep their old type as well as the new one. For example, if I were to terastallize an Arcanine (pure fire-type) into normal, would it still be weak to rock, water, ground, and be immune to burn, as well as normal's weakness, fighting, or would it only be weak to fighting and be susceptible to burn, like a pure normal-type?

Comments

Tera normal Arcanine should get fire STAB and act like a normal Pokemon for everything else.

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Stellar Tera keeps your base defensive type

Answer 1

Defensively it's as though after your Pokemon terastrallized it became monotype of whatever the tera type is, So arcanine would only be weak to fighting, as it's now a pure normal type.It would also be susceptible to burn. Offensively, Your Pokemon keeps it's previous Type STAB and gains the new one as well, So arcanine would get a STAB boost on fire and normal moves.

Hope this was a helpful answer!

Comments

K thanks! I knew the stab thing but it being pure type is important