I'm not sorry for Wobbuffet, I'm more sorry for the VA, who also did Brock.
...why? Having to show up for most dubbing sessions of the series just to say one word isn't a particularly wanted situation.
Sonansu appears in most episodes, but rarely says much at all - that's not a character you want to have as your only role, which is likely the exact reason they cast a VA who was already playing a main character in the role.
and it also makes it harder for a Brock cameo
No it doesn't.