WAIT WAIT WAIT WAIT WAIT WAIT...
If I am correct, that Anthony reference is about Focus Shift, and if I am reading correctly on my profile, Josh was sent back in time by Celebi.
Miharu, however, is 19 (two years older than Focus Shift!Miharu) AND has a slightly different past then Focus Shift!Miharu. For one, Focus Shift!Miharu battled Cynthia and lost, although she did beat the tournament and the elite four, and is the gym leader of Pallet Town. Plague!Miharu is the champion of the Kanto region, but is still friends with Cynthia. XD Sooo...not really sure what your logic is on that.