Pokémon games came before the Pokémon anime (which was made to promote the already existing videogames). The first games, Red and Blue, came in 1996 but you can find prototypes of Pokémon and drafts of the plot/dynamics even in earlier works by Sugimori and Tajiri. Also, in the videogame 'Mother', released only in Japan in 1989 by Nintendo, you can find a few similarities with Pokémon games which may imply that the general concept was already existing at that time: notably, in that game the protagonist had to collect 8 'Melodies' (like the 8 badges in Pokémon games), the quest of finding a man's golden teeth in Pokémon is similar to a mission in Mother, the final boss shares some similarities with Mewtwo (most of all, the place where the boss is found looks like a sort of uterus which may be linked to Mewtwo, since it's a Pokémon born in laboratory, in a sort of artificial uterus). Moreover, a music theme in Pokémon Black/White is very similar to a track contained in 'Mother 3'.
I'm not saying that Digimon copied from Pokémon or vice versa, but they were probably conceived at the same time (after all, the release date doesn't mean anything about the work made to produce the concept behind a game and the game itself. For instance, Pokémon White2/Black2 were created in a sort of rush in about a year, but another team was already developing Pokémon X/Y, which came out a year later, in 2013).
Other than that... (and I'm taking the videogames as a reference more than the anime which is boring and repetitive as hell)
- My knowledge of Digimon is very rusty since I used to like them for only about two years when I was little but, from what I can remember, in Digimon there are good Digimon and bad Digimon. In Pokémon, no Pokémon is evil, the only creatures being evil are humans, and that's why you have to fight teams (not just Team Rocket). Some humans try to corrupt Pokémon in order to use them for their plans, hence why the only enemies are teams (one or two for each generation of games).
- Ash never grows up it's true and that's why most grown Pokémon fans don't like the anime anymore, this is unnerving and annoying. About Pikachu, though, there is a specific reason. Pikachu refuses to evolve because he likes himself the way he is. He doesn't care to become more powerful, he just wants to be Ash's friend and stay on his shoulder, which is something he couldn't do if he evolved. He wants to prove himself and Ash that he can be worth something even without evolving. I think there's a good message behind this. You don't need to change yourself for others, be yourself and prove others wrong about their prejudices (in the first season there is a whole episode dedicated to this: Ash has to battle against Lt. Surge, a gymleader whose Pokémon is Raichu. Lt. Surge and other people tell him that he will never defeat a Raichu with its previous stage Pikachu, because Raichu is stronger. However, Ash lets Pikachu decide if evolving or not, and Pikachu decides not to because he wants to prove others that evolution doesn't mean anything and what's important is that you believe in what you're doing).
- The concept behind evolution is indeed different. Pokémon's evolution process has a 'Darwinism touch' in it: with evolution, a Pokémon becomes stronger, but also more mature. Pokémon's evolution is not just a battle boost, it is linked to what in real world is the physical process of growing up. I think this difference is what makes many PokéFans disappointed in Digimon's digievolution. To many of us (including me), it's unthinkable to see a creature come back to a previous stage, because it would be like seeing a grown up dog becoming a puppy again. That is also why when Mega Evolutions came, many protested because it made Pokémon look a bit like Digimon (since MegaEvolved Pokémon come to their previous stage when they're out of battle). Also, since I'm used to this concept of evolution, it makes me uncomfortable to see Digimon becoming completely different creatures without any apparent physical link to their previous stage (for instance, the cat digimon becoming an angel) or the fact that sometimes it seems that a new stage in Digimon visually means just 'some more weapons on your body'.
- I think some Digimons are cute, but I personally prefer the Pokémon style.
Just felt like giving the point of view of a PokéFan who won't just say 'Pokemon is better Digimon sucks!!1!!' even though I do find Pokémon better for my own taste (I don't like the violence in Digimon, so yeah).
*this is before Pokemon X and Y was a thing*
Drybonemon: Yeah. Digimon all the way.
Lizardmon: Who said "Pokemon look like a digimon now!" or "Digimon look like a pokemon now!"? Digimon look like Digimon. Pokemon look like Pokemon!
Drybonemon: Yeah. Whoever Said "Pokemon look like a digimon now!" or "Digimon Look Like a Pokemon Now!" must be bullshit.
*This is AFTER Pokemon X and Y was a thing*
Drybonemon: Oh alright. *Sees Pokemon's Mega Evolution* Oh my goodness! Mega Mawile looks... *Nosebleed* beautiful.
Lizardmon: Please get your Mega Mawile mind off, Drybonemon.
Drybonemon: I Know. They are Beautiful pokemon that made me nosebleed.
Mawile: Do I Look beautiful to you, Drybonemon.
Drybonemon: Yes, Please.
*Mawile Mega Evolves to Mega Mawile*
Mega Mawile: I'm a Beautiful Girl pokemon.
Drybonemon: *twitches then nosebleed* that look beautiful.
i tried looking at digimon and it just wasn't my type of show,im a huge anime fan but I just didn't like it,but I cant believe some idiot is posting pictures of digimon killing pokemon and splattering there blood all over and it just made me go insane
Ill try giving you a link to 1 of the pics
I mean, SEGA had some Pokemon games for their SEGA Pico consoles (the ones with the books), but that's only because SEGA and Nintendo are not rivals anymore.
Microsoft and Sony, on the other hand, are in strict competition with Nintendo. The idea for a Pokemon game on the XBox 360 sounds cool (so is Mortal Kombat vs. Street Fighter), but it's unlikely to happen, I'm afraid.
BTW, I used to have a SEGA Pico. Ahhh, what memories...