Tell you what? Here is my story:
Story
I wake up and I decide to become a Pokémon Trainer. I walk up to the Professor but he only had one Pokémon to give me. I walk up and take the Pokéball. In it, was a fresh Azurill. Perfect Stats (like how I usually have mines in Pokémon for a fact), Thick Fat, looks cool. It was only Level 5, however. It only knew Splash, Water Gun, Tail Whip, and Water Sport. I knew that I would be bound to it eventually.
I thanked the Professor and left his lab to train it. As I trained it, I heard the news that there is a champion waiting at a hill on a visit, and he says that he will only challenge mid-evolved Pokémon, for he did not like easy fights and did not like unfair fights. He also only allows one Pokemon to fight him. He also says that he will ONLY battle fresh trainers who have just started their journey within 3 days. I realized that I qualified for just that, and off I trained. I trained and eventually, it turned into a Marill. I went across the world, searching for the TMs and HMs I need, and X days later, I would arrive at the hill where this "champion" was waiting.
"A... pony?", said I as I began to laugh thinking that this would be easy. Until... "Young one. You must not insult me.", said this challenger. I was suprised to see a talking Pony (as if I thought I was already in a world where I see talking Pokemon (kudos if you got the reference)). "Oh, my apologies. Im just started my adventure X days ago. So, you are...", said me.
"King Thorax. I seek a challenge.", said Thorax. "Oh, highness, yes, I have a challenge for you.", I said as I bowed in respect for a royal combatant. My partner (Marill), who was behind me, was just so happening to be confused as to what is happening. "Marill?", it said. "You will be fighting this king, Marill. Cmon, dont be shy...", I said as I calmed it down. The Marill, now calm and confident, knew it had to go win the challenge, to impress me, to have me become a champion.
"Marill!", it said in a prepared and brave tone. "Thats the spirit!", I said, before continuing. "Remember what we practiced from the past X days, Marill. You will need it to win.". The king proceeded to speak: "Ah, Marill, I assume? its fine. We will spar. If you win, I will hail you as champion.", said the king. I knew this has to be the most challenging battle I will be in.
"All right, go Marill!", said I as I busted my Marill out. "Remember that I will be showing no mercy, mouse", said Thorax.
FIGHT!
Summary
To summarize this, I will have my mon freshly start off as a Azurill with perfect IVs at the start. It has the ability Thick Fat. I will have 1-3 days to prepare it, to evolve it to a Marill to Level 100. I am supposed to be responsible and try to give it just 4 moves, because thats how Pokémon works.
Easy: 3 days
Normal: 2 days
Hard: 1 day