first premutation shalpha hunt; pokémon isn't even registered in the dex. still worth it?

i'm on premutation 16 out of 49 and alpha typhlosion is so cool. :( I've yet to catch a single shalpha. i don't get shinies outside of outbreaks, I've never encountered one in the wild during my playthrough. dunno if this is worth it at this point though, they're so aggressive too I can barely catch them UUGHH