Best ball for Iron Boulder: Ultra Ball, Level Ball, Repeat Ball. “Best” here means a colour or theme match, not improved catch odds.
Best ball for Iron Boulder: Ultra Ball, Level Ball, Repeat Ball. These are the community colour-match recommendations — a look, not better catch odds.
No shiny recommendation is listed for Iron Boulder in this reference. This does not establish a shiny lock or which balls are obtainable.
Choose the appearance you prefer from the listed options. Normal and shiny Iron Boulder can suit different balls; these are community suggestions, not a measured ranking.
Source: Legal Matching Pokéballs 2.1 by OracleLink. Community recommendations, not a per-game legality checker. Availability depends on the game, form and encounter.
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