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Tropius doesn't actually look good in any pokeballs except for safari and nest ball, which are both already available with harvest, and maybe dream ball if you're going for a tropical sunset look. But it's still nice to have options. Shame SM didn't add a sun ball or some other cool tropical pokeball. Beast balls are pretty nice, but they don't scratch that itch unless you're going for a sea map look, and even then it only kind of works on dhelmise, who's better in a lure ball, and probopass, who's better in a dumpster.
What'll malamar look good in? Moon ball? Beast ball?