groudon is because he is a ground type and dialga is x10 weak to ground types
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It's the whole space, time thing like between groudon and kyogre.
yes,because diagla is a young legandary pokemon so he's weaker and Groudon is twice his size,and i know because i've fought groudon on a bunch of games and i always faint fighting him,but most of the time i beat him.
arceus,dialga,palkia,rayquaza,groudon,and kyogre ha ha just kidding
palkia
rayquaza because it has better stats