Umm... Right...
Well, the series has changes quite a lot since the first episodes. I think that they've stepped away from some traditional anime symbolism just for the younger kids, although I personally don't see the point.
If you're a true Pok?mon fan, don't kill the new people (if they are the new writers/artists.) They're only doing what they think is right.
About Larvitar:
I forgot to tell you that it's a baby. Of course it won't weigh like the average Larvitar from the start. (50 kilometers, Water Pokemon Master???)
About Random Explosions:
Actually, maybe the water reached the part that lifts the balloon, causes a rapid temperature change, causing the casing to rupture, then the fuel goes everywhere inside the balloon, and somehow the fire still sparks the fuel while inside the balloon, popping it like a bomb.
About the legendaries:
Hey, I didn't say that Ash was the first to see them. Although Eusine and the kid may have had visual confermation of Suicune and Entei, repecfully, the show never said that they've ever had actual confrontation with them, I think. When Ash was around, those two were first confronted by Ash. (Entei was staring at Ash when it appeared, I believe)
*The movies, especially the first one, must have been intertwined with the show. The first one is obvious. The only thing that I can think of is the Pok?mon that Ash and friends are bringing with them. With that in mind, you could attempt to figure out when the movies occured, although Ash and friends never talk about the show in the movie and vice versa.
Don't you guys get me started on Ash's love life because... He doesn't have one! If I can remember correctly, he's never had an actual girlfriend that he admits to. He only loves his mom like a child should to a parent. Since he's never been to school since turning 10, learning the concept of love will be quite hard for him, unless somebody foolishly explains it to him. Because of this, all of us can point and laugh at many hints thrown at him and he's still clueless as ever, keeping the show running. If he does know, however, I think the show would change a little too much.