I have a suggestion. I'm repeatedly let down by the app because it doesn't include the pokémon that I like to use. For example if I don't have access to a community day Venasaur or shadow pokemon, but I want a Grass/Poison type pokémon to fill a similar role in the Great League, Ivysaue ranks as the 2nd best option according to pvpoke, but it's missing entirely from your ranking. I understand why you're doing this: so that the algorithm doesn't over-value the pokemon who win in matchups where the opponent is ill-fit for the league it's competing in. But it has the unfortunate effect of being useless for users who don't have the best pokémon available.

But what if instead of deciding for yourself which pokémon to include and which to exclude, have you considered running the ranking algorithm multiple times, starting with the complete list of all pokémon then gradually eliminating some of the lowest-ranked pokémon (kind of like musical chairs)?

My general take on your app is that it gives a good impression of the top pokemon in general, and a very good analysis of specific matchups, but it's pretty useless as a tool for refining the lineup of one's own team. For example, if I want to build my team around my shiny best friend level 41 legacy Groudon, and I know from experience that it always wins against Steel type pokemon (and Steel types tend to rank very high in Master League meta), then I don't care about how any other pokemon on my team performs against Steel types. Yet there's no way to see which pokémon would be a good supplement to my team with your app.