La liga highest goal scorer in this season?
No context provided
La liga highest goal scorer in the 2016-17 season?
Messi Lionel Messi
No context provided
La liga highest goal scorer in the 2015-16 season?
Suárez Luis Suárez
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La liga highest goal scorer in the 2014-15 season?
Cristiano Ronaldo Ronaldo
La Liga's all-time top goalscorer is Argentine Lionel Messi, who also holds the record for most goals scored in a season with 50 goals in the 2011–12 season. Barcelona's Lionel Messi and Athletic Bilbao's Telmo Zarra, who was the competition's all-time top scorer until 2014, are the only players ever to win the top scorer's award in six seasons. Four other players, Real Madrid's Alfredo Di Stéfano, Quini of Sporting Gijón and Barcelona, and Hugo Sánchez of Atlético Madrid and Real Madrid — each finished as top scorer in five seasons.
La liga highest goal scorer in a single season?
Messi Lionel Messi
List of La Liga top scorers
List of La Liga top scorers
https://en.wikipedia.org/wiki/List%20of%20La%20Liga%20top%20scorers
Lionel Messi holds the record for most goals scored in a single season in La Liga with 50 in the 2011–12 season. 
List of La Liga top scorers
He was also the top goal scorer in the 2016-17 season with 37.
List of La Liga top scorers
Luis Suárez was the top goal scorer in the 2015-16 season with 40 goals.
List of La Liga top scorers
Cristiano Ronaldo was the top scorer in La Liga in the 2014-15 season with 48 goals.
List of La Liga top scorers
Lionel Messi holds the record for most goals scored in a single season in La Liga with 50 in the 2011–12 season. He was also the top goal scorer in the 2016-17 season with 37. Luis Suárez was the top goal scorer in the 2015-16 season with 40 goals. Cristiano Ronaldo was the top scorer in La Liga in the 2014-15 season with 48 goals.