Q1: If I activate this card's Main effect two or more times, can I give -6000 DP to different opponent's Digimon?
Yes. This Main effect activates again for each color your Digimon have, and you get to choose the target for each activation.
Q2: If I activate this card's Main effect two or more times, are they treated as activating at separate timings?
No, they're treated as activating at the same timing.
Q3: Does this card's Main effect activate three times when I have 1 2-color Digimon?
Yes, that's correct.
Q4: If I have a red/blue Digimon and a red/black Digimon, do they count as 4 colors and make this card's Main effect activate five times?
No, multiple instances of the same color count as 1 color. Therefore, for the situation stated in your question, red, blue, and black would count as 3 colors, so the effect would activate four times.
Q5: If I activate this card's Main effect two or more times, can I activate the effect for different opponent's Digimon each time?
Yes, this effect activates multiple times, so you can choose different targets each time it activates.
Heaven's Judgement EX4-068 C While you have a green Digimon or Tamer in play, you may use this card without meeting its color requirements. [Main] Activate the effect below. For each color your Digimon have, activate it again. • 1 of your opponent's Digimon gets -6000 DP for the turn. --- [Security] 1 of your opponent's Digimon gets -12000 DP for the turn.
Heaven's Judgement EX4-068 C While you have a green Digimon or Tamer in play, you may use this card without meeting its color requirements. [Main] Activate the effect below. For each color your Digimon have, activate it again. • 1 of your opponent's Digimon gets -6000 DP for the turn. --- [Security] 1 of your opponent's Digimon gets -12000 DP for the turn.
Heaven's Judgement EX4-068 C While you have a {{Colour|green}} Digimon or Tamer in play, you may use this card without meeting its color requirements. [Main] Activate the effect below. For each color your Digimon have, activate it again. • 1 of your opponent's Digimon gets -6000 DP for the turn. ---
ヘブンズ• ジャッジメント EX4-068 C 緑の自分のデジモンかテイマーがいる間、このカードは色条件を無視して使用できる。 【メイン】以下の効果を発揮する。自分のデジモンの色1色ごとに発揮する回数+1。 • このターンの間、相手のデジモン1体をDP-6000。 --- 【セキュリティ】このターンの間、相手のデジモン1体をDP-12000。