Shiny Noctowl said:
1. Can you evolve multiple Pokémon on the same turn (for example, evolve a Porygon2 to a Porygon-Z and a Grovyle to a Sceptile)?
2. Can you Level Up a Pokémon on the turn it was played or evolved?
3. To use foreign language cards, you have to have a printout of the English version of the card. I have the Japanese DP5 Porygon-Z Lv. X. The English Porygon-Z Lv. X has different art, so would the printout of that card still be sufficient to use the Japanese one?
1. Yes. You just can't evolve the same one twice under normal circumstances.
2. No.
3. No, the artwork has to be released in English.
I cite this, taken from the Tournament Rules: http://www.go-pokemon.com/op/tournaments/docs/2008-2009/Tournament_Rules.pdf
14.1.6. Unreleased Cards
From time to time players will acquire cards from a new set prior to its regular release
date, usually via a Prerelease or the Japanese equivalent of the set. These cards may not
be used in sanctioned tournaments until the regular release date of the set, as outlined in
Section 16, with one exception. Cards that are already tournament legal which have been
reprinted in an unreleased set, or the Japanese equivalent, may be used as long they are
easily identifiable as a reprinted card. This is typically only an issue when a reprinted
card receives new art, though other factors may create a similar issue. These cards should
always be played with the most recent wording of the tournament legal version of the
card.
Players who are unsure as to whether an unreleased card meets the exception above
should check with the Head Judge prior to the start of the event.
14.1.7.