Both the games are the same difficulty or its personal opinion,Though in Ruby you mostly see team Magma and can catch Groudon,Were as Saphire is Mostly team Aqua and Kyogre is able to be caught.
(Team Aqua mostly use Water types whilst Team Magma are known with Fire)
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The ruby and sapphire are on fire red and leaf green don't worry about the in ruby sapphire or emerald.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
there is no professor oak in ruby and sapphire
Ruby/Sapphire/Leaf Green/Fire Red/and i think Emerald. if not, trade from emerald to Ruby/Sapphire, and from ruby/sapphire to leaf green. You need to have the Sapphire and Ruby before you trade. you get these after the elite four.
You can't. You can only get jirachi in ruby and sapphire. You would have to trade from ruby or sapphire.