Clearly ORAS is the best entry in the series, but are there others you have strong opinions on?
X and Y are better than people think they are they just suffer from a short development time. BW and BW2 are really good. The rivals in SwSh have really good arcs that I was actually invested in (except Marnie, who I'm sure I'd be invested in if her brother wasn't way cooler than her). ScarVio has a good ending and the epilogue is fun but everything leading up to that is absolutely miserable (not an unpopular opinion). Platinum's pretty good. And RGBY, GSC, RSE, HGSS, SM, and USUM exist.
Oh yeah, also Legends is pretty good I guess but I'm not as hype over it as most people and I keep forgetting that the Gen 4 remakes exist.