Generation with best graphics

Generation 2 was so homey when I first played it. And I recall just how beautiful it was after coming from gen 1. The biggest upgrade and breath of fresh air with a new game.

I love Gen II, but I give the nod for top artwork to Gen III. By gen III the pokemon shapes had mostly been established, and the GBA allowed the capability to produce a full and detailed color palette. Emerald's animations didn't add as much as Crystal's did though.

Gen V also deserves a shoutout; the constantly moving pokemon were very cool and the locations pretty intricate. And I still have a soft spot for the artwork in Gen I, if not only to see oddities like Golbat's giant tongue.

Gen II, Crystal in particular, felt very Pokemon-ey for me so I'll go with that.

Gen4. If there is any 'best generation' or 'generation with the best ________' expect that to be the answer. And even then the graphics then were still some of the greatest things ever. Hate to admit but its probably even better than the 3D ones.

I'm incredibly biased towards anything Gen 4, but I honestly think the graphics are gorgeous. Smooth, colourful, detailed... really easy on the eyes.

Gen 5 had nice graphics as well, but like Nah said, it's rather pixelated. I liked how the trainers were taller and less squat.

At first I had my reservations about X/Y when it was announced, but once I started playing it that all changed for the better. It's graphics are pretty, with some great trainer designs, though I did not find the chibi look appealing!

And Gen 7 still looks great. It feels so clean; even walking is a joy for how smooth it is. One thing that bothered me is your trainer's unnerving smile—it was either that or a slightly shocked expression, haha.

I love the old games for looking so Pokémon-y though. They're certainly more nostalgic!

Gen VII without the outlines.

I'm probably a minority on this, but Generation Five. I remember thinking the graphics were really good at the time, considering the Nintendo DS was a dying console by the time the games came out. I thought the bridges and roads looked really realistic despite mostly being 2D. The 3D games still leave a lot to be desired, graphically for me, ngl.