I like Darkrai's Bad Dreams ability.
Even though it pains me to say it, I did capture Shaymin and Darkrai using the E4 glitch.
(Don't try it at home kids, it does have the ability to corrupt your game. Hiido's Box System no longer works. ;.;)
Having a very limited knowledge of the Japanese language, I didn't even think to look at Darkrai's ability. I decided to test him out in the Elite Four and I was incredibly suprised that my opponent lost health every turn after I used Hypnosis! Add Dream Eater to that and you have a nice little combination. ^.^
I personally like the Steadfast ability. It actually gives you a small boost for Pokemon that think they will get away with a Fake Out, but end up giving you a stat boost.
personally, Levitate is one of the koolest abilities ever period. Immunity to ground and to avoid spikes and tspikes, its pretty good. for DPPt, Im not sure, hmm....HYDRATION/leaf guard. Very convinient because then stalling is much more efficient =D
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75% of Pokemon gamers use cheats and specially made codes to make their pokemon battle-worthy. If you are one of the 25% percent that level their Pokemon up legally, put this in your signature.
^
Don't do it, most people hack because nubs think that all pokemon must be legit.
Levitate: Resistance to the most common used moved called Earthquake is awesome in my view.
Guts: This ability rocks when you can see your opponent using a status ailment move.
Natural Cure: Ability to "absorb" status ailments and easily get rid of it by switching is awesome as well.
Wait, are we supposed to pick our favorite abilities for D/P/Pt only, or can it be from FR/LG/R/S/E? Because I see some people listing 3rd Gen. abilities.
The most effective ability for me seems to be Intimidate, as it's impossible to block (barring Clear Body and Hyper Cutter), and can really cripple physical Pokemon.
Well I gotta go with these:
Mold Breaker-Great ability
Bad Dreams-Hypnosis/DarkVoid+Nightmare+Dream Eater+BadDreams=Really good combo.
That's really all. I like quite a few FR/LG/R/S/E abilities especially WonderGuard and AirLock,
My favorite Diamond/Pearl/Platinum exclusive ability would have to be Tinted Lens. It helps Choice item Pokemon A LOT. This way, they won't have to switch out when they encounter, lets say your Pokemon is using Bug Buzz, and suddenly Salamence pops out. You don't have to switch and it has potential to KO on the switch-in. I use it on Yanmega, since too many people expect Speed Boost. :x
Sandstream is my overall favorite, since it's extremely team-supportive and crafted the incredibly powerful "Sand Storm" themed teams. However, my other favorite ability would have to be Pure Power. Doubling your attack stat is awesome