Each of the two Pokemon has its roles in the Uber metagame.
Dialga is generally regarded as an outstanding all-around Pokemon. It can fill multiple roles on teams and provide great resistances with its dragon/steel typing. Its great stats allow it to potentially be a sweeper both physically and specially. It can run stat-up sets, sweeper sets, choice sets, you name it. It also has a unique role in VGC (or tournament Doubles) as a bulky Trick Room user.
Hp: 100
Att: 120
Def: 120
SpA: 150
SpD: 100
Spe: 90
Mewtwo is also known as an oustanding all-around Pokemon. It is found offensively as well as defensively. Generally, it is used with more of a specially focused move set in mind. It is usually found running a calm mind + taunt set in Pokemon battles. It can, however, also run choice sets, other sweeper sets, defensive sets, and a Dual Screen set as well.
Hp: 106
Att: 110
Def: 90
SpA: 154
SpD: 90
Spe: 130
Let's look at it stat wise. Mewtwo has a higher Speed. Dialga has a higher attack, defense, and special defense. They're essentially tied in Hp and SpA. Stat-wise, Dialga is superior. However, do keep in mind that movesets and party Pokemon are a large factor in the effectiveness of a Pokemon. Speed is also essential as a sweeper.
In the end, I would have to say that both Mewtwo and Dialga are extremely viable Pokemon in the Uber tier. They both have their strengths and weaknesses, and neither one has a distinct advantage over the other.
dialga or pakia
spear pillar
in my opinion arceus but it is more so how you use them
magikarp can be found up to lv 100 in the resort area
no, dialga is in pokemon diamond. PALKIA is the one in pokemon pearl
dialga or pakia
Its the Pokemon creators way of making you buy both Diamond and Pearl... so you can get Palkia and Dialga...
its is dialga
the strongest Pokemon is arceus.then shymin,dialga,palkia and giratina.
you have to get pakia or dialga first
not realy
The most most most most most most Strongest Pokemon is ARCEUS then Giratina then Dialga and palkia
Its either lugia or dialga. no way its arcius
arceus dialga palkia gratina mew and mewtwo
In the sinnoh dex it is dialga but if you mean after you beat the game it is Mewtwo
spear pillar
dialga but arceus is better but arceus can only be obtained through spetial event