There is bulbasaur, charmander, squirtle, caterpie, weedle, pidgey, pichu, nidoran boy, nidoran girl, cleffa, igglybuff, zubat, oddish, poliwag, Abra, machop, bellsprout, geodude, magnemite, gastly, rhyhorn, happiy, horsea, elekid, magby, porygon, dratini, chikorita, cyndaquil, totodile, togepi, marep, azurill, hoppip, swinub, larvitar, treecko, torchic, mudkip, wurmple, lotad, seedot, ralts, slakoth, whismur, aron, budew, trapinch, duskull, spheal, bagon. beldum, turtwig, chimchar, piplup, starly, shinx, and gible.
That list only involves Pokemon that evolve twice into something different.
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Catch a whismur and evolve it twice, once into loudred and again into exploud.
Pidgey will evolve twice as on other games, at lvl 18 Pidgey evolves into Pidgeotto, and at lvl 36 Pidgeotto will evolve into Pidgeot.
Tympole can evolve twice. Their first opportunity to evolve comes at Level 25, when it can evolve into Palpitoad. It can evolve a second time at Level 36, when it can evolve into seismitoad i hope i helped :)
Starly only evolves twice, so Staraptor is the final evolution and can't evolve. In fact, no pokemon can evolve three times, so it wouldn't be smart to assume that Starly can.
There is not really a easiest pokemon to evolve...but bug type pokemon evolve really fast