Who is stronger than mew?

Answer 1

There isn't one single "strongest" pokemon since there are many ways to determine the strength of pokemon.

1. If looking solely at a stat such as attack, defense, etc. or overall stats, there are many pokemon who outclass mew. Mew's base stats are all 100 (with a sum of 600) leaving it tied with pokemon such as Shaymin, Heatran, etc. outclassed by others. The pokemon with the highest overall stat is Arceus.
2. Looking at the movepool, Mew has access to one of the most diverse movepools in the game (meaning it can learn a lot of different moves). There are very few pokemon, if any, that can match the size of Mew's movepool.
3. Pokemon can play various roles on a team such as a rapid spinner, a wall, a sweeper, etc. There are pokemon who do these jobs better than mew does. At the same time, Mew has its own role that it can play better than anyone else

There are many different ways to classify strength so there's no single answer to this question. Many pokemon are stronger than mew in some ways, and weaker than him in others. Therefore, there is no clearcut answer for your question.

Answer 2

The starting stats are the same. Their typing and abilities, as well as their leveling up pool, are where they differ. Mew is great because it can learn literally any move in the game. From TMs, TRs in Sword and Shield, Move Tutor moves, etc. If there is a way to learn the move, it can be learned. The only exceptions are moves that are taught exclusively to certain Pokemon, like Draco Meteor, being only taught to Dragons by the tutor, or the elemental hyper beams being taught to the final evolutions of each starter. This doesn't mean Mew cannot learn them in the lore; it only means these tutors will not teach Mew. So, with Mew, the possibilities are endless, with the most common being a special attacker. Its leveling pool is also geared toward being a more offensive mon.

Where Jirachi excels is in its ability to use Serene Grace, which doubles the chances of additional effects of moves being applied, and its steel typing. Both of these allow Jirachi to wall a lot of mons and survive hard attacks. First off, it can learn "Wish", which heals for half its max HP. Second, it has access to cosmic power, which raises its defense and special defense by 1 stage each. So immediately, you have access to defense boosts and healing. It also has access to a plethora of moves with secondary effects, like Zenheadbutt with a Flinch chance and Meteor MASH for the Attack stat being raised. In BDSP, its access to moves is more on the special side, allowing

The starting stats are the same. Their typing and abilities, as well as their leveling up pool, are where they differ. Mew is great because it can learn literally any move in the game. From TMs, TRs in Sword and Shield, Move Tutor moves, etc. If there is a way to learn the move, it can be learned. The only exceptions are moves that are taught exclusively to certain Pokemon, like Draco Meteor, being only taught to Dragons by the tutor, or the elemental hyper beams being taught to the final evolutions of each starter. This doesn't mean Mew cannot learn them in the lore; it only means these tutors will not teach Mew. So, with Mew, the possibilities are endless, with the most common being a special attacker. Its leveling pool is also geared toward being a more offensive mon. it to get Psychic, Shadow Ball, Flash Cannon, and Energy Ball, all of which lower Special Defense. Once access to them opens up, it gains access to Iron Head for more flinch, Play Rough for attack reduction of the target, and the elemental punches to inflict various statuses like Burn, Freeze, and Paralysis.

Both mons are very versatile, but between the two most competitive players, I would choose Jirachi for the defensive capabilities it has. Using both on an in-game team, though, still works in your favor, though. I mean, 100 base stats across the board is fantastic.