Forum Thread
Easiest Dex to Complete
Forum-Index → Help → Answered → Easiest Dex to CompleteKanto is hard coz Ditto.
Hoenn comes in second. Castforms are easy to get as well
Kanto - Hard, due to ditto and the bird trio being rare lab adopts or expensive gem collector trades. Mew requires you to wait for a certain time of the year but isn't hard if you save up some DP before that.
Johto - Easier, collecting the unowns might take some work but you can always trade for them too. The doggos and lugia aren't too hard to obtain yourself and if Game Center isn't your cup of tea, they're not the rarest or expensive legends. Ho-oh is probably the biggest roadblock here.
Hoenn - Similarly on the easier side. Castform shouldn't be hard if you keep your eye on the weather. The regis might be tricky to get yourself if you're not good at the royal tunnel but, again, not the hardest to get through trade. The other legends are summon items that might take a while to get yourself or trade for but should be perfectly doable.
Sinnoh - A bit trickier due to many different legends. If you don't do a lot of interacting and thus not a lot of golden slot, uxie, mesprit and azelf could be a bit of an expensive find. Dialga, palkia, and heatran are more summons so not a big issue. As well as giratina, but that minigame is difficult for some. Manaphy is not an issue if you're a regular at the game center but cresselia and darkrai can be harder to get and more expensive to trade for. Shaymin is a bit of a timing issue if you wanna get it yourself since it's only available through interacting at a certain time, but you could probably trade for it.
Unova - Not as hard as it used to be thanks to victini becoming easier to obtain. But again, there's a bunch of legends with a lot of different ways to get them so what you find easy may differ. Tornadus, thundurus, and landorus might be tricky if you only play on mobile or simply don't like the safari zone. Cobalion, terrakion, and virizion will take some time and effort in the berry garden so that's too bad if you're not a fan of gardening. Reshiram, zekrom, and keldeo are more summons so not that hard with a bit of patience and/or luck or money. Kyurem is another timed thing similar to shaymin. Meloetta will take some time playing things at the emera square, though the berry battles are a great way to amass some festival points in a short time if you can participate.
Kalos - Will probably take some time but not that hard if you have the patience. With xerneas, yveltal, and all the zygarde formes requiring a bunch of gems, saving up might be a long time project but it is a fairly simple project. Thanks to the dream world update that gives you gems for sending out plushies, that project has also become a little easier. Hoopa and volcanion should we fairly easy to get with a bit of hunting and fishing or you can get them by trading easier than a lot of other legends.
Alola - Plenty of summons here again so luck and time or a bunch of money needed. Namely, cosmog and its evolutions and the ultra beasts, you've got your work cut out for you with that. Miniors are gonna require some trading and/or breeding but I'd say not the hardest acquisition. For tapus, you gotta remember to hop in here to interact at the right times and may require a different amount of months to achieve depending on your available time and internet connection. Zeraora is another timed interaction like shaymin or kyurem so yet again some waiting and interacting or trading to do. Halloween is a bit far away now so marshadow is gonna be a bit of a wait if you wanna get one yourself, it should be easier to trade for than many other legends though since I think there's users trying to hatch a shiny yearly after it was released so there's surplus floating around. Meltan is another summon but seems to be a bit harder to get your hands on still even though it's been around a while now? Magearna, well, more game chips needed to sink there and a lot of luck.
Galar - A bit trickier on the region variants than alola since you gotta please the gem collector to unlock more recruitable pokemon. But if you use a lot of gems filling up other dexes, this may be an easy task for you. The fossils and eternatus don't seem to be that hard to fish up, but you need a fisherman hat for the latter and that may take a while to get if you don't wanna spend a lot of money. Zacian and zamazenta are harder still since their summons and forme change items aren't yet in the mystery boxes as far as I'm aware.
So, at the end, I'd say Hoenn or Johto might be the easiest dex to complete in my humble opinion but again, you may find a different dex easier depending on what you find to be an easy activity here on PH and what's more difficult for you.