Its the writers fault, for some reason they wanted him to be a newbie first half of the series. I think they are doing better with him now though.
i agree. he seems to go from being good at the end of a series and becomes a noob for the next. then half way through he makes a leap from noob to slightly more advanced. he needs to stay as good as he was in the last series.
Always watching. Always waiting. Never truly at peace in a realm of its own.
Giratina will return....someday.