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I always wondered why they kept Brock for so long. In Hoenn he was always in the background because the majority of focus went to Ash and May, and then even Max tended to get more eps in Hoenn than Brock did.
Then in DP, Brock became a real third-wheel with Ash and Dawn as co-stars, and all the recurring rivals like Paul, Zoey, etc. got more focus too. Brock was literally just there.