|Number||155 (Japan only)|
|Series||Mystical Energy Series|
|Maximum carriers||12 Pikmin|
|Challenge Mode levels||None|
The Proton X (プロトンＸ?) is a treasure exclusive to the Japanese version of Pikmin 2. It is a National Hi-Top AA battery. It is found in Submerged Castle on sublevel 4, and is the equivalent of the Proton AA.
Collecting the treasure
Olimar and the Hocotate ship's notes for this treasure are the same as the ones used for the Proton AA, except in Japanese.
- Text: “この星で最初に見つけたお宝によく似ている。だがよく見ると、大きさが少し違うようだ。たまには以前のお宝一覧を読み返してみようか。苦労した思い出にふける夜も悪くない。”
- English Proton AA notes: “This object resembles the first treasure I found on this planet, so it holds certain sentimental value to me. However, I've just noticed that the size it slightly different. Sometime, I should take the time to read my previous treasure log book. It's good to reflect on the past sometimes...”
- Text: “ホコタテ星には存在しない謎のエネルギーがここに！ 謎すぎて使い道が浮かばないのがたまにキズ。”
- English Proton AA notes: “Some enigmatic energy unknown on Hocotate is trapped inside: who couldn't use more energy?”
The Proton X in the Submerged Castle.