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JEMC said:

The comment I read talked about Dragon Quest without specifying which one. For all I know, he/she could have been talking about the main series, on the NES.

You can capture monsters in the main series too but its not through a device, its closer to SMT series than Pokemon (i.e DQ3 and DQ8 I know do this, but by defeating monsters and asking if you want them to join or not).