None.
Palkia: Dragon/Water type
Zekrom: Dragon/Electric type
Palkia is a Dragon/Water type, so Electric type attacks would be normal against it.
Electric is not very effective against dragon.
I'd say their even. You can't exactly compare them Stat-wise due to Palkia being a Sp.Attacker and Zekrom being a Physical Attacker.
Personally, Its up to you. Go for Palkia if you want a Special Attacker or Zekrom if you want a Physical Attacker.
Both are Dragon type, so they can be super-effective against eachother in battle. Although Zekrom's special move(s) are Electric type (Fusion Bolt and Bolt Strike) he can learn a variety of Dragon type attacks.
Palkia's special move is Dragon type (Spacial Rend).
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you can get lugia,palkia,dialga,zekrom and reshiam
No. Regigigas can cream Palkia! However, Palkia's speed is faster. It could attack first.
Lugia is stronger! Palkia is weaker. Palkia's strongest move is spacial rend=power100. Lugia's strongest moveS are sky power=power140, hydro pump=power120, and aero blast=power100.
you get zekrom in Pokemon white version and resheriham in Pokemon black.(in my oppinion, it should be the other way around, zekrom in Pokemon black, and resheriham in Pokemon white version) IT IS JUST LIKE PUTTING DIALGA IN POKEMON PEARL AND PALKIA IN POKEMON DIAMOND.
Zekrom