Shiny swablu in Pokémon Scarlet N Violet

So like 

A month or so ago (I think??) I caught a shiny swablu!! Wow yay!! 

BUT 

BUT 

I FEEL AS IF ITS ONE OF THE SHINIES THE GAME GIVES YOU FOR FREE LIKE THE PONYTA IN LEGENDS ARCEUS BECAUSE IVE SEEN SO MANY PEOPLE WITH SHINY ALTARIAS AND IM CONFUSINGS??

CAN SOMEONE TELL ME IF IM LUCKY OR IF ITS A SHINY THE GAME PUTS IN FOR EVERYONE