>>432211121. Be really good at competitive Pokemon.
2. Become a Poketuber who does competitive/showdown videos. Acquire a decently large fanbase.
3. Pick some random shitmon that you think could reasonably have a niche in a higher tier.
4. Start making videos where you beat a bunch of low-ladder noobs with your shitmon and make your shitmon look really good.
5. This is where step 1 becomes important. Get high on the ladder using only teams with your shitmon, to the point where a reasonable person would question whether the shitmon is really as shitty as everyone assumed.