i said it to over than 135 players and i'll say it again
when finding a valuable poke wheher its was HR or S:
1- NEVER EVER ATTACK IT
2- before going to catch a poke , supply urself with more than 300 poke ball , because a bagon once made me catch him after the pokeball number 135
3- get a strong poke high lvl , because lol if you have pokes lvl about 30 or 40 and ur infront of a lavitar he's going to sweep you , high lvl pokes above lvl 80 will assure u to be safe from blacking out
4- final and the most imp one , if you caught it , RELOG INSTANTLY , because if a crash happened , bye bye poke
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hope this helped