CREATE TABLE "pocket_monsters_diamond_pearl_series" (
  "num" real,
  "japanese_title" text,
  "r_maji" text,
  "japanese_translation" text,
  "vocalist" text,
  "episodes_used" text
);

Question: Name the romaji by your side ~hikari's theme~ (popup.version)
SQL: SELECT "r_maji" FROM "pocket_monsters_diamond_pearl_series" WHERE "japanese_translation"='By Your Side ~Hikari''s Theme~ (PopUp.Version)';

Question: Name the vocalist for kaze no messēji (pokapoka-version)
SQL: SELECT "vocalist" FROM "pocket_monsters_diamond_pearl_series" WHERE "r_maji"='Kaze no Messēji (PokaPoka-Version)';

Question: Name the least number for  君のそばで～ヒカリのテーマ～(popup.version)
SQL: SELECT MIN("num") FROM "pocket_monsters_diamond_pearl_series" WHERE "japanese_title"='君のそばで～ヒカリのテーマ～(PopUp.Version)';

Question: Name the number of vocalists for  which one ~ is it?
SQL: SELECT COUNT("vocalist") FROM "pocket_monsters_diamond_pearl_series" WHERE "japanese_translation"='Which One ~ Is It?';