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The consensus on the pre-stored data kind of "allowed, but considered cheesy". We have one such example in the Nanorumble (See LBB), and it's generally considered to be an amusing novelty rather than a serious competitor because it does this.

In the upper ranks of the megabot rumble, it would probably be considered bad form unless it's a one-off experiment of "let's see how well this does", which would be considered interesting instead of bad form.