They tend to be a bit less of a challenge as time goes by, yes; after a while it becomes a matter of levels as opposed to a matter of skill, unless you're raising several creatures at once and so can stagger the teams you're using based on the gym you're up against.
I completed the entire Johto circuit myself a while back; I would suggest it, if battling interests you. I have yet to see Kanto for myself, outside of Vermilion City; perhaps I'll do so one day, but for the time being it doesn't hold my interest.
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They tend to be a bit less of a challenge as time goes by, yes; after a while it becomes a matter of levels as opposed to a matter of skill, unless you're raising several creatures at once and so can stagger the teams you're using based on the gym you're up against.
I completed the entire Johto circuit myself a while back; I would suggest it, if battling interests you. I have yet to see Kanto for myself, outside of Vermilion City; perhaps I'll do so one day, but for the time being it doesn't hold my interest.