Of course Pokemon games are easy; they're marketed at all ages, and you can't really market a game at all ages without lowering the difficulty bar considerably. Pokemon is by nature an easy series, because any and every challenge can be overcome by level grinding. Truly difficult JRPGs are ones where levels don't matter and you have to take advantage of other mechanics to win and, whilst type matchup IS important in Pokemon, you can overcome even that if you grind enough. It's not designed to be difficult.
That said, it's quite a difficult thing to judge if things have gotten any easier: as you play games and get older, you get more experienced. As the core gameplay of Pokemon has changed very little over the years, of course you're going to find subsequent titles easier than the one that came before it, as you're more familiar with the mechanics. Back in the days of Red and Blue, I had absolutely no clue about type matchups, and it wasn't until Diamond and Pearl that I started having the patience to grind levels to beat Gym Leaders. Before that I'd use my favourites and damn the type matchups, and I'd run from one Gym to the next without training my team properly. You can imagine how that went. As you learn how the games work, of course you're going to find them easier...but that doesn't necessarily mean that they're easier for everyone, or easier overall. Take the knowledge you have of Pokemon now and give them to your younger self, and you'd probably find the older titles easier too, because you'd know what you're doing.
People say the current generation are easier than past titles, but I think it's more that the exploits to make them so are more readily available. Remember how hard you had to hunt for the EXP share in the original games, and how late you got it? Remember when Lucky Eggs didn't exist? You never used to get EXP for catching Pokemon either.
It's not so much easier as it is more accessible. Remember, you don't HAVE to use these things if you don't want to. Pokemon is designed to be easy, but there is plenty of room for you, the player, to make them more challenging if you want to. Self-imposed restrictions can always make games harder.